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MC-34749

Hopper: java.lang.IllegalStateException: failed to create a child event loop - Caused by AntiVirus / Firewall software

Resolved
Invalid
0

Moderator Note

  • This issue is most commonly caused by a broken installation of Avast! free edition Anti-virus software. A reinstallation of Avast! and a reboot usually fixes it.

    • McAfee anti-virus software (and derivatives) are also know to cause this issue, and currently the only known solution is to uninstall this software to correct the problem.

    • Also Outpost security may cause that issue.

  • This error also occurs when Java tries to open a socket on the IPv6 stack, but could't get a connection to the outside world. Try forcing the use of the IPv4 stack by adding -Djava.net.preferIPv4Stack=true to the JVM Arguments in your launch installation (to edit your JVM arguments, click "Edit" on the profile you are using, then click "More Options").

Please visit Community Support for further support.

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-294053/

Crash:

java.lang.IllegalStateException: failed to create a child event loop
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:61)
	at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
	at mo.<init>(SourceFile:36)
	at net.minecraft.server.MinecraftServer.<init>(SourceFile:114)
	at brh.<init>(SourceFile:38)
	at ays.a(SourceFile:1585)
	at bbs.e(SourceFile:162)
	at bbt.a(SourceFile:214)
	at bam.a(SourceFile:186)
	at bbs.a(SourceFile:187)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// Don't do that.

Time: 10.10.13 17:10
Description: Rendering screen

java.lang.IllegalStateException: failed to create a child event loop
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:61)
	at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
	at mo.<init>(SourceFile:36)
	at net.minecraft.server.MinecraftServer.<init>(SourceFile:114)
	at brh.<init>(SourceFile:38)
	at ays.a(SourceFile:1585)
	at bbs.e(SourceFile:162)
	at bbt.a(SourceFile:214)
	at bam.a(SourceFile:186)
	at bbs.a(SourceFile:187)
	at bkv.b(SourceFile:851)
	at ays.ab(SourceFile:783)
	at ays.e(SourceFile:706)
	at net.minecraft.client.main.Main.main(SourceFile:103)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
	at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
	at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:57)
	... 15 more
Caused by: java.io.IOException: Unable to establish loopback connection
	at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.nio.ch.PipeImpl.<init>(Unknown Source)
	at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source)
	at java.nio.channels.Pipe.open(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl.<init>(Unknown Source)
	at sun.nio.ch.WindowsSelectorProvider.openSelector(Unknown Source)
	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
	... 18 more
Caused by: java.net.ConnectException: Connection refused: connect
	at sun.nio.ch.Net.connect(Native Method)
	at sun.nio.ch.SocketChannelImpl.connect(Unknown Source)
	at java.nio.channels.SocketChannel.open(Unknown Source)
	... 26 more


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:61)
	at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
	at mo.<init>(SourceFile:36)
	at net.minecraft.server.MinecraftServer.<init>(SourceFile:114)
	at brh.<init>(SourceFile:38)
	at ays.a(SourceFile:1585)
	at bbs.e(SourceFile:162)
	at bbt.a(SourceFile:214)
	at bam.a(SourceFile:186)
	at bbs.a(SourceFile:187)

-- Screen render details --
Details:
	Screen name: bry
	Mouse location: Scaled: (203, 62). Absolute: (406, 355)
	Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2
Stacktrace:
	at bkv.b(SourceFile:851)
	at ays.ab(SourceFile:783)
	at ays.e(SourceFile:706)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w41a
	Operating System: Windows Vista (amd64) version 6.1
	Java Version: 1.6.0_13, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
	Memory: 132615600 bytes (126 MB) / 170655744 bytes (162 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w41a
	LWJGL: 2.9.0
	OpenGL: GeForce GT 220/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [faithful32pack.zip]
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-294053/16540251/

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MC-95438 All day I haven`t been able to play at all and when I open a world it crashes and says it is unable to create a child event loop MC-95486 Java.lang.NullpointerException when trying to join Multiplayer, and causes game to crash when I play Singleplayer in versions later than 1.6 MC-95497 The game crashes when I try to make a world or join it MC-95512 No online/No gameplay MC-95524 Can't play singleplayer or go online. MC-95753 Minecraft crashing when making/joining worlds, and joining any servers MC-96060 Minecraft 1.9 snapshot(S) crash after creating a new world MC-96251 Launcher cannot even connect to internet. Also crashes instantly once I try to enter a world. MC-96425 trying to create a world crashes the game MC-96525 Singleplayer worlds crash at "Building Terrain" MC-96590 Messed around with Java now I can't play MC-96604 java.lang.IllegalStateException: failed to create a child event loop MC-96721 Crash MC-97031 Description: Updating screen events java.lang.IllegalStateException: failed to create a child event loop MC-97944 Updating Screen Events MC-98187 Everytime i try to play on Minecraft there is always a Crash report on any version, even the Demo. MC-98560 Bug-ant open mc MC-98771 ive had a problem with logging in but i fixed that now i cant play like it crashed i didn't even get into the game yet and i just bought it today pllease help me MC-98894 Everytime I try to play a World in Minecraft it says "Building Terrain" then Freezes and Crashes MC-99002 Keeps crashing when loading world :( MC-99977 when entering / making world this happend MC-99978 single player issue MC-100221 The game crash in the moment that I open any world. MC-100251 Recently re-downloaded minecraft refuses to play single player or online. (sadface here) <lol> MC-100521 I cant load a world or join a server MC-100753 I can't get in the actual game MC-100832 The game opens in offline and time to play so close all MC-100868 I was trying to record a video on both the current and alternate version of minecraft, but it keeps on crashing whenever I opened a world whether I'm recording or not. MC-101080 game will not start MC-101098 Minecraft not working (only 1.7-1.9) MC-101121 game crashes when i load the world. the report says: failed to create a child event loop MC-101347 Game crashes when loading world MC-101367 java.lang.nullpointerexception: group MC-101471 crash of the program MC-101599 Crash MC-101609 Minecraft does not load MC-101670 Please help MC-101808 Can't open Minecraft. After going into a new world or old world it crashes. no matter what I do MC-101930 ever since 1.9 first came up no servers or single player worlds will work, this is not the same issue where Vsync and VBO's aren't on. i have no clue what is wrong with it MC-101994 impossible to launch Minecraft MC-102145 Crash generating singleplayer world/enter created world crash MC-102208 Tried to start the game and log in into a world, but the game crash every time... MC-102398 Updating screens event MC-102428 Game crash everytime I try to open a world. MC-102768 wont start up worlds, cant connect to minecraft.net services, wont let me update to any newer versions. all launchers are affected (ex: technic platform launcher) MC-103120 Cannot open any worlds MC-103219 Unable to Play Minecraft Even After Reinstalling MC-103521 Minecraft crashes MC-103687 Can't Play Minecraft,When i open The Launcher it is always offline *my internet is working* and when i start a singleplayer world it crashes always MC-103711 Bug and crash Game MC-103740 Every time i try to connect to singleplayer MC-103919 cant load world/server MC-104540 Crash MC game starting 1.10.2 MC-104927 Minecraft crashed after opening a minecraft world MC-105262 Can't log in the game MC-105318 Unable to play minecraft whatsoever MC-105486 My Game Crashed...again...and again....AND AGAIN! MC-105533 Error generating world MC-105587 Trying to play Minecraft while connected to internet. Minecraft page only offers the "Play Offline". The game goes to the list of worlds, then it crashes after I select a world to play. MC-105610 Minecraft crashes when joining or creating a single-player world! MC-105840 Crashes on Creating a New World MC-105841 Can't load Minecraft MC-105877 When I try to enter with a version 1.10 crashes. MC-106725 Minecraft Crashes When I Try To Launch A World MC-106852 Client Crash MC-106954 Minecraft 1.10.2 Crashes MC-107039 I can't play. MC-107067 Minecraft is crashing while trying to build or load a world MC-107091 when ever i try to open a world to play it just crashes MC-107093 when ever i try to open a world to play it just crashes MC-107146 Game crashes when trying to load a world. MC-107306 could not launch the game in some way whether, despite several attempts. MC-108004 Please. Please. Help. MC-108823 Game crashes after building terrain but before starting MC-108828 i have Problem in minecraft MC-109387 Every time I open a world in any version it crashes pls fix it MC-109502 broken MC-109843 keeps crashing MC-109910 I am using a windows 64-bit OS computer with Java version 1.8.0. Everytime I press new world it begins to load the world then crashes. I have already fixed my drivers and memory and it is still crashing when I try to play. MC-110014 i cannot go into any server and i cant go into my worlds MC-137182 crashes whenever i open any world MC-110020 My Minecraft says im offline, when im not, then when i get on a server it greats me with a error message, and when i try to get into singleplayer it kicks me off. MC-110129 I click on new world and it says "building terrain" then it crashes before placing me in the world MC-110302 I can't play. MC-110584 Fail to login MC-110762 game has crashed MC-111222 Critical, Crashing MC-111481 Minecraft Crashes on World Load MC-112125 World not started but created MC-112197 Cannot load worlds--old or new. Game keeps crashing when loading worlds. MC-112320 Whenever I try to play minecraft 1.9 - 1.11.2 it gives me a crash report and I don't know why. MC-112366 crash when trying to open world MC-112552 Minecraft Crashes MC-112773 I turned the launcher on like usual and the normal launcher page did not show up. Instead there was a blank white screen and it said play offline. I selected my world and when I clicked on it to play the game crashed, closed and went back to launcher. MC-112851 Game Crashes Upon "Building Terrain" Load Screen MC-112905 I can't open or create mc world MC-113040 Dosnt Load bigger than 1.6.4 MC-113234 crash when started MC-113503 Crashing. MC-113548 Bug in the Launcher MC-113776 Still Crashing MC-114145 The game crashed whilst updating screen events MC-114414 java.lang.IllegalStateException: failed to create a child event loop MC-114792 The game crashes getting into a game (multi or single) MC-115337 World Crash MC-115403 Game crash MC-116232 impossible de chargé une map MC-116389 fermé l'application pendant le chargement de carte MC-116689 Cannot launch Single Player or access Realms MC-117095 Minecraft don't work per 1.7.2 to 1.11.2 MC-117740 Error loading a world MC-117786 Spiel hängt sich jedes Mal nach dem Start auf MC-118663 Updating screen events MC-118735 UUID Crash MC-118775 Crash when Loading World MC-118780 Java Error on SMP / Game Crash joining Singleplayer MC-119765 Minecraft crashes on loading world/building terrain screen MC-120022 java.lang.IllegalStateException: failed to create a child event loop MC-120049 Game crashes when starting new game or trying to open world MC-120088 problemas al cargar el mundo MC-120525 I can't run minecraft after the version of 1.8.9 MC-120919 Can't launch single or multiplayer MC-120937 1.10 and higher crashing. NO McAfee on PC! MC-120964 Tried to launch world, repeatedly crashes upon terrain generation MC-122634 Crash on World Load MC-123225 My game crashes after loading a world MC-123599 Minecraft crash... MC-124485 Crash MC-124573 My minecraft isent starting under windows 10 MC-124706 Starting new world or opening previous causes immediate crash MC-124797 Everytime I load a world my game crashes MC-125015 minecraft launcher keeps crashing MC-125908 Game Crash MC-127436 minecraft crashes when loading/creating new world MC-127732 Just purchased - single player crash on startup; can't play 1.12.2 MC-131848 Game crashes when trying to load world MC-133074 Game crash on building terrain MC-133522 Minecraft crash on world start MC-134636 Creating new world MC-134742 1.13 Crash MC-134745 1.13 Crash MC-135718 Cannot create or join worlds, and cannot connect to any servers (CRASH) MC-135819 Just got another crashes after loading world. MC-136017 Error MC-136021 Minecraft startup bug. MC-136223 Creating new world/loading old worlds crash Minecraft MC-136559 The game crashed whilst mouseclicked event handler Voir plus de détails MC-139471 The game crashed whilst mouseclicked event handler | Error: java.lang.IllegalStateException: failed to create a child event loop MC-141810 The game crashed whilst mouseclicked event handler Error: java.lang.IllegalStateException: failed to create a child event loop MC-142910 mouseclicked event handler MC-143227 The game crashed whilst mouseclicked event handler MC-144002 Failed To create a child event loop MC-144200 java.lang.IllegalStateException: failed to create a child event loop at io.netty.util.concurrent.MultithreadEventExecutorGroup MC-144687 The game crashed whilst mouseclicked event handler MC-144707 Game Crash after loading a world MC-144731 The game crashed whilst mouseclicked event handlerThe game crashed whilst mouseclicked event handlerError: java.lang.IllegalStateException: failed to create a child event loop MC-149702 Crash on loading/entering world (100% at loading screen) MC-153725 run.bat file keeps crashing after few seconds MC-155197 mouseClicked event handler MC-155248 Crashes on loading world MC-155796 Game crashing after creating new worlds ( mouseClicked event handler ) MC-155808 The game crashed whilst mouseclicked event handler Error: java.lang.IllegalStateException: failed to create a child event loop MC-155960 CRASH EVERYTIME I JOINED OR CREATED A NEW WORLD MC-156046 Le jeux crashe pendant le chargement du monde MC-156124 The game crashed whilst mouseclicked event handler Error: java.lang.IllegalStateException: failed to create a child event loop MC-157919 mouseClicked event handler MC-158223 Failed to create a child event loop MC-158232 Failed to create a child event loop MC-158236 Failed to create a child event loop MC-159047 Cant create or enter to a world MC-160741 Game crashes while creating world in minecraft 19w36a MC-166720 mouseClicked event Handler MC-168105 Crashes while loading into a new or old world at 100% MC-168403 The game crashed whilst mouseclicked event handler Error: java.lang.IllegalStateException: failed to create a child event loop MC-170331 The game crashed whilst mouseclicked event handler Error MC-171979 Error: java.lang.IllegalStateException: failed to create a child event loop MC-173151 when i open a world the game crashes it says failed to create a child event loop. i am writing this again as i found no resolved cases MC-173938 Crash while trying to enter singleplayer MC-173987 failed to create a child event loop MC-175151 minecraft MC-178137 game launch bug MC-178782 child event loop/mouseClicked event handler MC-181380 The game crashed whilst mouseclicked event handler Error: java.lang.IllegalStateException: failed to create a child event loop MC-181741 Error: java.lang.IllegalStateException: failed to create a child event loop MC-182905 Stuck- Failed to Create a Child Event Loop exists in all versions newer than 1.8.9 MC-183879 World connection Issue MC-184171 The game crashed whilst mouseclicked event handler Error: java.lang.IllegalStateException: failed to create a child event loop MC-185918 The game crashed whilst mouseclicked event handler Error: java.lang.IllegalStateException: failed to create a child event loop MC-188861 遊戲無法遊玩 MC-190636 failed to create a child event loop MC-192511 I can't log in to my world MC-193155 error and crash when trying to start my java minecraft 1.16.1 server MC-193516 Crash Upon Loading Minecraft World (java.lang.IllegalStateException; failed to create child event loop) MC-197856 Minecraft Superflat Crash with the same error as MC-156124 MC-200446 my minecraft java edition keeps crashing MC-200456 1.16.3 MC-201933 Multiplayer unaccesible MC-202921 Mit Version 1.15.3 war alles OK. Die Version 1.16.3 stürzt ab mit ExitCode -1 MC-203415 Logged on then saw that there was no detection for internet connection for multiplayer. MC-205869 Lancement Minecraft (création d'un nouveau monde) Crash MC-208326 I cant make a single player world or join a server/realm and a has a text show up MC-210057 java.lang.IllegalStateException: failed to create a child event loop MC-210261 Game Crashed Upon Opening World & Joining Online Servers MC-219451 Game crashes upon loading or creating world MC-220362 Im getting an issue: java.lang.IllegalStateException: failed to create a child event loop MC-220724 Crash whilst mouseclicked event MC-221134 I can´t do anything anymore! MC-225613 Exit Code Negative 1 MC-235024 The game crashed whilst mouseclicked event handlerError: java.lang.IllegalStateException: failed to create a child event loopExit-Code: -1 MC-235490 Failed child event loop MC-240422 I updated to the newest minecraft launcher and the world crash MC-240705 Upgrading to the new launcher causes game to crash when loading worlds MC-240709 the game crash when I try to start any world version 1.17.1 - windows 11 MC-240807 New Minecraft Launcher MC-240886 I can't log into a single world or any server. MC-241031 error: java.lang.illegalstateexception MC-241045 I can't join realms nor singleplayer worlds MC-262975 Unsolved minecraft crashreport! MCL-2599 When clicking minecraft world, it doesn't work MCL-2983 Crashing loading worlds MCL-3092 Crashes when creating a new world as first time user MCL-3496 My minecraft opens only when I play Multiplayer does not load the servers and neither of them to enter. When I try to play Minecraft Singleplayer error and closes itself. MCL-3756 Crashes at start up MCL-4117 Minecraft was launching fine. Now when you launch any world it crashes MCL-5473 Offline Play Not Working (Old Launcher) MCL-6616 i cant do anything in 1.11.2 worlds crash servers have no conection MCL-7409 Upon loading any world old or new the game crashes MCL-7831 Crashes when launching game MCL-7839 game crash !? MCL-8748 Minecraft Crash Report MCL-8764 Minecraft entra e carrega o mundo e sai aparecendo o crash report. MCL-8855 Crash MCL-8884 whenever trying to join a sever i get java.lang.NullPointerException: group or java.lang.illegalstateexception and whenever i make a world it crashes MCL-9277 cannot start any worlds NOT BY ANTIVIRUS NO DUPLICATES MCL-9278 cannot start any worlds NOT BY ANTIVIRUS NOT A DUPLICATE MCL-9552 Crashes after launcher update MCL-10237 Havent been able to play for a year MCL-10308 我的游戏在创建世界是会崩溃，退出到启动器界面 MCL-10309 游戏在创建世界时崩溃，并退回启动器界面 MCL-10310 游戏在创建世界时崩溃，并退回启动器界面 MCL-10311 游戏在创建世界时崩溃，并退回启动器界面 MCL-10312 The game crashes when it creates the world and returns to the starter interface MCL-10777 cant launch single player game MCL-10813 Starten vom Singelgame geht nicht MCL-10867 Crash no minecraft MCL-10900 Indítási hiba, új világ létrehozása után az alábbi hiba üzenet van MCL-11018 Fail to launch game MCL-11933 Game Keeps crashing fails to create child event loop MCL-12169 Crash Report MCL-12777 Minicraft Crash MCL-13392 Erreur : java.lang.IllegalStateExeception: failed to create a child event loop MCL-17427 不能打开

relates to

Comments

bugi74

For me, the same/similar stacktrace/exception was caused also by firewall. In my case Comodo. (I had purposefully blocked javaw.exe, as it can be used by all kinds of software, including those with malign intentions.)

The reason (for my case, normal single-player gaming) why it pops up now is apparently because previously Minecraft used a direct connection within a JRE (running both the single-player server and the client), or at least something else than a network socket, to communicate between the server and the client, but now it apparently wants a real socket, even if it is between the same JRE (or at least the same host). Real socket means network layer firewalls can now catch it. Oops.

I didn't disable/uninstall anything, I just adjusted the firewall's rules to allow outgoing access from javaw.exe. Not ideal (as it would be better if I could get it to block javaw in general, but allow access when the starter of the javaw.exe was minecraft.exe), but the solution shall do for now.

kumasasa

Isn't that pointless that a "Firewall" blocks access to localhost ? Don't get it...

bugi74

Counter-question would be, isn't it pointless to use a network socket to communicate between two threads (or even processes) of basically the same application running from the same user account?

Typically localhost access should be ok, especially on a typical consumer PC, but there are cases/situations where an application should be blocked from any network connections, including localhost. It is more appropriate that the default of a firewall should be "block all access" for any application that is not specifically allowed to have some access (with installation providing a bunch of rules to have less annoying times figuring out all the operating system processes etc.)

The difference is between occasionally giving permission to an app that for some reason needs it, or never noticing something, possibly nasty, happening.

I'd guess many a firewall has a default rule of allowing localhost access to any process which isn't specifically disallowed to have it, but... it is the compromise between convenience and security. I like to err on the side of security.

migrated

I get this bug, trying to open any single-player world. I have Avast antivirus, and have for a couple weeks now. My worlds would load just fine until yesterday, it seemed as though there was server-side lag (block lag, teleporting to previous places, etc.), when playing my single-player worlds. And then, today, I get this error.

migrated

Windows 7 Version 6.1.7601, Java 7u45

Redirected here from MC-43077. Getting this issue too. Currently using Avast! Premier. Only way I can get the server to run is to disable the firewall.

migrated

The most recent update of Avast! seems to fix this problem (at least with Avast!).

migrated

I have Sophos and I have disabled Sophos firewall and computer firewall. I also went into the settings and added minecraft and java as a trusted app. Still cannot create a new world! Still get the "Failed to create child loop". Any more ideas??

migrated

Just to put in my 2 cents, i have avast premier also, and i just checked to see if there were any updates. Yayy to my surprise i had an update to go tp version 2014.9.0.2013. After a required reboot i can finally open the game. Before the reboot i added minecraft.exe to the list of application rules setting it to all connections, and i also set java to all connections. I have a feeling the update is what fixed it. Good luck all!!!!

migrated

I managed to fix the issue. Although I had turned the firewall off in Sophos, it really was not "off". I had to go into msconfig in the servies tab and disable the Sophos firewall. Minecraft works! And it also fixed my internet browser issues. Hope this helps others.

migrated

I dont have a firewall - I dont even have antivirus. And I still get this error.

migrated

i hope this bug is fixed...

kumasasa

There is nothing to fix on the side of Minecraft as it's an issue of the host computer.

migrated

It appears I posted a duplicate earlier. Anyway, I turned off all of the avast shields and disabled every firewall on my computer and I get the exact same issue with an identical crash report.

migrated

Can you just explain me step by step how to solve it?

kumasasa

Please visit the #minecrafthelp channel for further support.

migrated

Completely uninstalling my antivirus software fixed the issue. It was avast! Free antivirus. The software was apparently blocking the game without notification.

galaxy_2alex

Invalid
Caused by overprotective security systems and/or Malware, not an issue on Mojang's side.

migrated

I tried to switch off all antivirus software and firewall and even add the bound rules. it doesn't work

galaxy_2alex

@ruopuwang: We're not a support page, please visit the #minecrafthelp channel for further support.

migrated

I am seeing this crash a lot with mcafee.

migrated

Every issue I report redirects me here and says it is Avast. I have gone so far as to completely remove Avast and any malware program and firewall on my comp. I have reinstalled Java and I still get this issue.

migrated

Hey guys, so I have had Minecraft for a while, no problems at all. Just a week ago, I tried to play my world, and the game crashed and gave me the java.lang.IllegalStateException: failed to create a child event loop problem. I also tried to join multiple servers and got this: java.lang.NullPointerException: group. I do NOT have any mods, I have a good computer (Windows 7), and I can do full graphics and render with no lag. I don't have McAfee and I temporarily disabled Windows Firewall. I have also reinstalled java and Minecraft.The only thing left to check is Microsoft Security Essentials, it hasn't blocked anything before, but It is constantly updating. Do you guys have any ideas to what else i could to to troubleshoot?

migrated

I have been dealing with this error for five-six months already. Uninstalling McAffe completely does not do the trick.

The only option for my side of the situation is getting my own PC and try translating (or abandoning) my account.
Next time get Norton instead

Game Over...

migrated

None of the solution works for me, how do i get further support ?

kumasasa

Please follow that link of the panel of the bug description:

Moderator Note

Please visit the #minecrafthelp channel for further support.

migrated

I was directed here because it said that it was as duplicate. I do not have McAfee or Avast! so I would really like to get some help on this. My own bug is posted here: MC-97031 I'm practically begging at this point because it has been since July or August of 2015

kumasasa

@unknown: Please follow that link of the panel of the bug description:

Moderator Note

Please visit the #minecrafthelp channel for further support.

migrated

Aurora Kay, the I had the same problem a few months back. I didn't have McAfee or Avast, but then on the minecraft help channel, one of the computer genius guys directed me to this program that scans my pc. I sent him a link of the results of the scan, and he pointed out a program that was bought by McAfee, and after i uninstalled it, minecraft worked fine. So i would suggest going on the mc help channel from time to time. and eventually a genius will go on. Sorry, i don't remember the program that he directed me to.

migrated

I recently got Avast updated. It must be that. Thank you so much for the help!

migrated

how do you get rid of a anti virus software

migrated

It differs slightly with the software, but usually right-clicking it and hitting the "uninstall" button works. You do need the admin username and password though. What anti-virus software do you have?

migrated

Alright, if you really think it's a duplicate, fine.

But I'm having this exact same issue and I have no antivirus on my computer. I just bought Minecraft yesturday and I'm rather sad that I can't launch the most recent version...

migrated

I have absolutely NO ANTIVIRUS. I don't know what to do to fix this

migrated

Same situation here as the two gentlemen above me.

migrated

I don't have Avast or McAfee. I have tried whitelisting Java and whitelisting mincraft. I have Trend Micro, and the program works fine on another computer, and used to work fine on this one as well. Please help.

migrated

I had same but it did not happen before
MC-124797

migrated

This can be also caused by a outdated version of Killer Control Center
Solution is to Uninstall Killer Control Center and go to their website and download the new version
https://www.killernetworking.com/driver-downloads

migrated

Hope this helps: when Java was updated so if your FW or AV is blocking java, it will crash. Update rules for the appropriate sw

I still don't understand why java need network access for a single player local mode

bugi74

Some background for why java/minecraft needs network access for single player...

Depending on the case, the starter application may try to connect to outside world to check your Mojang/minecraft account.

The single player minecraft was changed at some point to work as a local client and a local server, with full network connection (to localhost) in between. The change made some coding simpler, but also some things less efficient, and made many a firewall to barf about it - and some barf silenty, leaving users to wonder about errors like in this issue.

Depending on the particular FW/AV etc. application, some are smart enough to allow most loopback network connections, but some do not as they consider any and all network connections just as paranoid way whether they connect back to the same computer or to external network.

reddi

I found a different solution, where neither firewall nor antivirus were the culprit.

This error also occurs when Java tries to open a socket on the IPv6 stack, but could't get a connection to the outside world. Try forcing the use of the IPv4 stack by adding -Djava.net.preferIPv4Stack=true to the launch options.

kumasasa

Thanks, @unknown, added your comment to the panel in the description.

SolidBlock

Soluted as "invalid" but affected versions should include 1.13 and 1.13.1.

 

SolidBlock

Sometimes I reboot and it doesn't appear, but this time it still appears after rebooting.

It has been normal for a long time even I'm running 360-safe (360安全卫士) and Windows Defender.

Now 360-safe is not running. Should I close some functions of Windows Defender?

migrated

Hey Reddi or anyone else who knows this. How do I open up the minecraft Launch options? Sry where do I put them under the launch options??

migrated

I have another solution for this problem. The antivirus and java arguments did not work for me. 

I found that you can refresh your ports by doing the following. 

 

1) Open a cmd.exe window as administrator (You can type command into the Start Menu - Run box, then right click on Command Prompt and select Run as Administrator)

2) Type "netsh winsock reset" without the quotes

3) reboot.

 

This immediately fixed the problem for me. Using 1.13.1, trying to connect to a Cubedhost server.

[MOD] Greymagic27

Confirmed in 1.13.2

migrated

This can also be caused by Proton VPN, likely because it's misconfigured or does something strange at the network level. Turning off my VPN fixed the issue.

migrated

pls helppppppp!!!

when i try to open a world the game crashes pls help to resolve it. it says failed to create child event loop. im using version 15.1.2 . please i request help  me

 

 

migrated

same

migrated

I've totally disabled Norton, (computer, network and web) but still getting this error message.  Checking Norton logs, there was no update to Norton prior to this error message happening.

Please explain how it is the firewall.

 

migrated

Hi, I try all methods how I can fix this problem please. I want to play.

migrated

This is still a problem. I uninstalled McAfee, and the crash still happened.

galaxy_2alex

@Reuven: This is a bug tracker, not a support website. Please visit Community Support for further support.

migrated

These solutions worked for the exact same problems for many people.

  • The other solutions mentioned on here

  • Update Graphics Card Drivers

  • If you have NVIDIA apply default settings to the game

  • If you don't have anti-virus or security software but have Windows Defender, in Windows Defender turn off Private Network Protection under "Firewall & Network Protection"

*What * may * have worked for me, it's far too early to tell, is this.*

  • Open a terminal as an administrator and type these commands one after another. This will reset your computers WINSOCK, IP4, and IP6 Network. Reboot your computer after entering the following commands.

 

netsh winsock reset
netsh winsock reset catalog
netsh int ipv4 reset reset.log
netsh int ipv6 reset reset.log

 

A temporary solution for me was to

  1. Open you're minecraft game folder, often named .minecraft and

  2. Close the launcher and any game instances

  3. Delete these folders. If some don't exist that's fine: assets, bin, libraries, versions, webcache, config, defaultconfigs, usercache.json, usernamecache.json

  4. If you're using forge, you''d need to re-download and re-install it otherwise for official versions let the launcher do that for you.

  5. I often found I got one to two tries successfully everytime before it began messing up.

A thing to note

  • Sometimes you can keep re-trying to open the world, I found it has a big chance of opening correctly the second time but begins to get more and more difficult to open subsequent times often requiring more continual tries before it just becomes nigh impossible to open.

This is everything I can think of and every solution I could find on the internet related to this exact bug that helped people.

My Experience

Without any changes at all it suddenly stopped working. I didn't install anything, or remove anything, I had Kapersky which has never given me problems for years and I even completely disabled and closed out of it which didn't help, Windows didn't do any updates, I have no idea why it suddenly broke but it just did leaving me a bit stranded.

Suggestion to the Mods

@Galaxy_2Alex May I suggest adding these to the possible resolutions box above, it would probably help future people with this problem. 

dwang

Also one thing to note:
Minecraft does not play well with VPNs, so make sure all VPNs are disabled (preferably uninstalled). I just had one user who got this error when trying to open worlds or enter servers with a VPN on.

migrated

Some VPN software implement hacks that allow select apps to connect to their service while letting other apps connect to the internet without VPN. Unfortunately, some of these does not work with Minecraft and would make Minecraft run into this issue.

If this is the case, try turning off your VPN.

migrated

I have this problem nothing is solved the only thing and that the 1.17.1 and the snapshot I can not access it but the later versions yes and I tried everything I found the problem lately when I updated to windows 11 and nothing is solved someone some ideas. 
Ah the problem arose even after downloading the new launcher, now I can only play the new versions using third-party apps

migrated

Hi. I have the same problem, I upgraded to Windows 11 and now I have the same error when entering minecraft. Have you solved this problem? Can you help me?

migrated

Después de 20 días buscando la solución encontré la gema preciosa.

Lo unico que tienen que hacer es, descargar java desde este link https://www.oracle.com/java/technologies/downloads/#jdk17-windows

Después lo extraen dentro de su carpeta en C:/Archivosdeprograma/Java , pegan la carpeta que extrajeron ahí, van a su launcher, editan la ruta de path de java, ponen el jawaw.exe que esta dentro de la carpeta y nada, a disfrutar 
After 20 days looking for the solution I found the precious gem.

All you have to do is download java from this link https://www.oracle.com/java/technologies/downloads/#jdk17-windows
Then they extract it into their folder in C: / Program Files / Java, they paste the folder they extracted there, they go to their launcher, they edit the java path, they put the jawaw.exe that is inside the folder and nothing, to to enjoy

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i solved check the post

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Hello

I have done all the possible procedures found on the web and I still cannot solve the problem, I have windows 11, but before having windows 11 the problem already existed

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as someone wrote above, had to download newest JDK from oracle site and set the java path to it in minecraft launcher

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(Unassigned)

Community Consensus

antivirus, firewall, singleplayer

Minecraft 13w41a, Minecraft 13w41b, Minecraft 13w42b, Minecraft 13w43a, Minecraft 1.7, ..., Minecraft 1.7.4, Minecraft 1.7.5, Minecraft 1.7.9, Minecraft 1.13.2, 1.14.4

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