Players instantly kicked upon joining the server.

A small handful of members on my server have witnessed this too and I can see it in the log whenever it happens. They login and then are immediately logged out. The error that pops up is very similar to the one that you provided, but its always slightly different (different error codes).

Some of the members can fix this by restarting their Minecraft client all the way back at the launcher. Another member was unable to log in for a whole day.

Can someone please attach the appropriate section of the development console of a client ?

Also, I downgraded to 13w39a and the player was still getting disconnected. He got this error:

A fatal error has been detected by the Java Runtime Environment: Client> # Client> # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x696c09ba, pid=4112, tid=1236 Client> # Client> # JRE version: Java(TM) SE Runtime Environment (7.0_40-b43) (build 1.7.0_40-b43) Client> # Java VM: Java HotSpot(TM) Client VM (24.0-b56 mixed mode windows-x86 ) Client> # Problematic frame: Client> # C [atioglxx.dll+0x6909ba]

Aha.
Everyone with AMD card gets kicked crashes if someone places a painting or frame, see MC-31618
Updating to Catalyst 13.9 or 13.10 beta may help.

Deleting the players player file (username.ini) will fix the issue for that player. Very odd.

Because the player spawn at world spawn and not where they left (and where probably item frames and paintings were placed) ?

My guys keep getting the issue. I'll try to get the client side error, but this is the server side message in 13w41a.

[22:43:13] [Server thread/INFO]: TraditionalChef/IP logged in with entity id 781502 at (170.0, 81.0, 26.0)
[22:43:13] [Server thread/INFO]: TraditionalChef joined the game
[22:43:15] [Netty IO #4/ERROR]: Channel became inactive!
[22:43:15] [Server thread/INFO]: TraditionalChef lost connection: TranslatableComponent{key='disconnect.genericReason', args=[Internal Exception: java.io.IOException: Connection reset by peer], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[22:43:15] [Server thread/INFO]: TraditionalChef left the game

And his crash report:

Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 10/10/13 4:04 PM
Description: Unexpected error

java.lang.NullPointerException
at bkv.a(SourceFile:303)
at ays.o(SourceFile:1278)
at ays.ab(SourceFile:755)
at ays.e(SourceFile:706)
at net.minecraft.client.main.Main.main(SourceFile:103)

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

– Head –
Stacktrace:
at bkv.a(SourceFile:303)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bip['TraditionalChef'/795073, l='MpServer', x=170.00, y=82.62, z=26.00]]
Chunk stats: MultiplayerChunkCache: 75, 75
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-84,64,156), Chunk: (at 12,4,12 in -6,9; contains blocks -96,0,144 to -81,255,159), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 17421357 game time, 6109178 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 65 total; [bip['TraditionalChef'/795073, l='MpServer', x=170.00, y=82.62, z=26.00], xm['Fireball'/795147, l='MpServer', x=194.91, y=41.84, z=7.13], wn['Zombie Pigman'/795146, l='MpServer', x=192.97, y=82.00, z=-8.41], wn['Zombie Pigman'/795145, l='MpServer', x=195.56, y=83.00, z=-5.09], xm['Fireball'/795144, l='MpServer', x=192.78, y=58.09, z=-11.00], xi['arrow'/795150, l='MpServer', x=198.74, y=42.04, z=82.09], xi['arrow'/795149, l='MpServer', x=203.78, y=82.04, z=79.75], wn['Zombie Pigman'/795148, l='MpServer', x=192.88, y=81.00, z=19.69], wn['Zombie Pigman'/795137, l='MpServer', x=179.06, y=44.00, z=80.53], wn['Zombie Pigman'/795136, l='MpServer', x=179.50, y=43.00, z=70.00], wn['Zombie Pigman'/795143, l='MpServer', x=197.03, y=73.00, z=-23.72], qw['Experience Orb'/795154, l='MpServer', x=6335.00, y=2179.97, z=2920.00], qw['Experience Orb'/795155, l='MpServer', x=6566.00, y=2211.97, z=2950.00], qw['Experience Orb'/795153, l='MpServer', x=6393.00, y=2179.97, z=3060.00], vq['item.item.sulphur'/795158, l='MpServer', x=201.50, y=82.13, z=88.97], qw['Experience Orb'/795156, l='MpServer', x=6605.00, y=2275.97, z=2995.00], vq['item.item.ghastTear'/795157, l='MpServer', x=203.88, y=82.13, z=89.00], wn['Zombie Pigman'/795091, l='MpServer', x=107.56, y=38.00, z=-3.38], wn['Zombie Pigman'/795093, l='MpServer', x=107.50, y=38.00, z=-6.50], wn['Zombie Pigman'/795092, l='MpServer', x=102.41, y=38.00, z=-1.56], wn['Zombie Pigman'/795095, l='MpServer', x=96.28, y=37.00, z=3.84], wn['Zombie Pigman'/795094, l='MpServer', x=104.78, y=38.00, z=-5.00], vq['item.tile.hellrock'/795096, l='MpServer', x=111.91, y=82.13, z=54.38], vq['item.tile.hellrock'/795099, l='MpServer', x=113.00, y=82.13, z=54.16], wn['Zombie Pigman'/795233, l='MpServer', x=237.94, y=81.00, z=89.34], wn['Zombie Pigman'/795232, l='MpServer', x=230.38, y=13.00, z=73.50], xm['Fireball'/795074, l='MpServer', x=165.69, y=94.50, z=29.97], wn['Zombie Pigman'/795215, l='MpServer', x=213.83, y=44.69, z=89.22], wn['Zombie Pigman'/795122, l='MpServer', x=161.10, y=81.00, z=54.94], wn['Zombie Pigman'/795214, l='MpServer', x=214.00, y=43.00, z=84.41], wn['Zombie Pigman'/795121, l='MpServer', x=175.69, y=42.00, z=60.11], wn['Zombie Pigman'/795213, l='MpServer', x=219.00, y=42.00, z=83.38], wn['Zombie Pigman'/795212, l='MpServer', x=216.54, y=82.00, z=73.72], vq['item.tile.hellrock'/795120, l='MpServer', x=170.13, y=41.13, z=51.13], vq['item.tile.hellrock'/795211, l='MpServer', x=219.06, y=78.13, z=67.88], vq['item.tile.hellrock'/795210, l='MpServer', x=219.00, y=68.13, z=65.63], wn['Zombie Pigman'/795209, l='MpServer', x=208.93, y=53.19, z=57.53], xo['Small Fireball'/795208, l='MpServer', x=210.19, y=53.09, z=12.84], wn['Zombie Pigman'/795207, l='MpServer', x=215.53, y=35.00, z=-1.44], xo['Small Fireball'/795206, l='MpServer', x=212.81, y=72.19, z=-26.31], wn['Zombie Pigman'/795135, l='MpServer', x=183.69, y=41.00, z=64.94], wn['Zombie Pigman'/795134, l='MpServer', x=184.88, y=43.00, z=74.00], wn['Zombie Pigman'/795133, l='MpServer', x=191.41, y=81.00, z=24.15], xm['Fireball'/795132, l='MpServer', x=177.66, y=65.22, z=-19.38], wn['Zombie Pigman'/795106, l='MpServer', x=150.59, y=97.00, z=55.91], wn['Zombie Pigman'/795230, l='MpServer', x=229.69, y=12.00, z=54.44], wn['Zombie Pigman'/795107, l='MpServer', x=153.91, y=97.00, z=62.47], wn['Zombie Pigman'/795231, l='MpServer', x=236.47, y=12.00, z=63.16], wn['Zombie Pigman'/795104, l='MpServer', x=158.00, y=97.00, z=37.66], wn['Zombie Pigman'/795105, l='MpServer', x=154.28, y=97.00, z=44.56], wn['Zombie Pigman'/795110, l='MpServer', x=153.34, y=97.00, z=64.16], xm['Fireball'/795111, l='MpServer', x=153.34, y=30.03, z=84.00], wn['Zombie Pigman'/795108, l='MpServer', x=153.28, y=81.00, z=64.69], wn['Zombie Pigman'/795224, l='MpServer', x=211.69, y=82.00, z=92.03], wn['Zombie Pigman'/795109, l='MpServer', x=158.72, y=97.00, z=65.31], wn['Zombie Pigman'/795225, l='MpServer', x=217.56, y=82.00, z=85.25], vq['item.tile.hellrock'/795222, l='MpServer', x=223.25, y=82.13, z=84.84], wn['Zombie Pigman'/795223, l='MpServer', x=216.28, y=82.00, z=90.06], vq['item.tile.hellrock'/795220, l='MpServer', x=221.13, y=82.13, z=85.13], vq['item.tile.hellrock'/795221, l='MpServer', x=221.66, y=82.13, z=83.47], vq['item.tile.hellrock'/795118, l='MpServer', x=168.88, y=41.13, z=48.88], xi['arrow'/795218, l='MpServer', x=216.78, y=82.05, z=85.16], vq['item.tile.hellrock'/795119, l='MpServer', x=170.25, y=41.13, z=54.56], qw['Experience Orb'/795216, l='MpServer', x=6712.00, y=2467.97, z=3019.00], wn['Zombie Pigman'/795217, l='MpServer', x=210.00, y=78.00, z=94.75]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Non-integrated multiplayer server
Stacktrace:
at bik.a(SourceFile:302)
at ays.b(SourceFile:1924)
at ays.e(SourceFile:720)
at net.minecraft.client.main.Main.main(SourceFile:103)

– System Details –
Details:
Minecraft Version: 13w41a
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 212790872 bytes (202 MB) / 343998464 bytes (328 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 27451 (1537256 bytes; 1 MB) allocated, 1507 (84392 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 13w41a
LWJGL: 2.9.0
OpenGL: GeForce GTX 650 Ti Boost/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2421 (135576 bytes; 0 MB) allocated, 2421 (135576 bytes; 0 MB) used

Deleted both the username.dat and username.json files and everything worked. Replaced the username.dat file and he'd crash upon login. Removed the .dat and replaced the .json and he was able to stay logged in but with empty inventory and everything.

Solved, put both the .dat and .json back and then teleported the player to me immediately upon login.

this happens on my 1.10.2 server.
I have the message from the server:

[10:14:44] [Server thread/INFO]: 10zada10 joined the game
[10:15:04] [Server thread/INFO]: 10zada10 lost connection: TranslatableComponent{key='disconnect.genericReason', args=[Internal Exception: java.io.IOException: Connection reset by peer], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[10:15:04] [Server thread/INFO]: 10zada10 left the game

I deleted the .dat and .json files and it works fine for the first minute, then it kicks them off. And after that when they log in it immediately kicks them off. What is strange it does not matter who the player is but the computer. I logged in with there account on the computer the server is on and it works fine, only on specific machines. It also seems that it almost always happens immediately when they are standing on water.
I do not know if it is the same issue or a different one.

This server is currently not port forwarded and is running local. The client's machine was in the same LAN if that makes a difference.

Crash Report:

Minecraft Crash Report ----
// This doesn't make any sense!

Time: 6/29/16 9:04 AM
Description: Updating screen events

java.lang.UnsatisfiedLinkError: no net in java.library.path
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at java.net.AbstractPlainDatagramSocketImpl$1.run(Unknown Source)
at java.net.AbstractPlainDatagramSocketImpl$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.AbstractPlainDatagramSocketImpl.<clinit>(Unknown Source)
at java.net.DefaultDatagramSocketImplFactory.createDatagramSocketImpl(Unknown Source)
at java.net.DatagramSocket.createImpl(Unknown Source)
at java.net.DatagramSocket.<init>(Unknown Source)
at java.net.MulticastSocket.<init>(Unknown Source)
at java.net.MulticastSocket.<init>(Unknown Source)
at bzo$a.<init>(SourceFile:72)
at bhj.b(SourceFile:72)
at bft.a(SourceFile:372)
at bcx.a(SourceFile:900)
at bga.a(SourceFile:240)
at bft.a(SourceFile:346)
at bga.a(SourceFile:498)
at bft.k(SourceFile:409)
at bft.p(SourceFile:386)
at bcx.t(SourceFile:1586)
at bcx.av(SourceFile:968)
at bcx.a(SourceFile:396)
at net.minecraft.client.main.Main.main(SourceFile:124)

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

– Head –
Thread: Client thread
Stacktrace:
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at java.net.AbstractPlainDatagramSocketImpl$1.run(Unknown Source)
at java.net.AbstractPlainDatagramSocketImpl$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.AbstractPlainDatagramSocketImpl.<clinit>(Unknown Source)
at java.net.DefaultDatagramSocketImplFactory.createDatagramSocketImpl(Unknown Source)
at java.net.DatagramSocket.createImpl(Unknown Source)
at java.net.DatagramSocket.<init>(Unknown Source)
at java.net.MulticastSocket.<init>(Unknown Source)
at java.net.MulticastSocket.<init>(Unknown Source)
at bzo$a.<init>(SourceFile:72)
at bhj.b(SourceFile:72)
at bft.a(SourceFile:372)
at bcx.a(SourceFile:900)
at bga.a(SourceFile:240)
at bft.a(SourceFile:346)
at bga.a(SourceFile:498)
at bft.k(SourceFile:409)
at bft.p(SourceFile:386)

– Affected screen –
Details:
Screen name: bhj
Stacktrace:
at bcx.t(SourceFile:1586)
at bcx.av(SourceFile:968)
at bcx.a(SourceFile:396)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.10
Operating System: Windows Vista (x86) version 6.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 8311672 bytes (7 MB) / 186810368 bytes (178 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.10
LWJGL: 2.9.4
OpenGL: Quadro FX 1800/PCI/SSE2 GL version 2.1.2, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because EXT_framebuffer_object is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Xeon(R) CPU W3520 @ 2.67GHz