Michael Blaine
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If there is a problem with netty then everyone playing that version of minecraft will have the same problem(As netty's version does not differ per person, but per minecraft version), A suggestion: try manually changing the version of your current netty file to a higher or lower version, an see if that makes a difference, but before you can change any of the libraries within the libraries folder without it automatically replacing itself you must change this line within your current minecraft version's .json file from this: "
{"downloads": {"artifact": {"path": "io/netty/netty-all/4.1.25.Final/netty-all-4.1.25.Final.jar", "sha1": "d0626cd3108294d1d58c05859add27b4ef21f83b", "size": 3823147, "url": "https://libraries.minecraft.net/io/netty/netty-all/4.1.25.Final/netty-all-4.1.25.Final.jar"}}, "name": "io.netty:netty-all:4.1.25.Final"}"
to something like this(depends on netty version): "
{"downloads": {"artifact": {"path": "io/netty/netty-all/#.#.##.Final/netty-all-#.#.##.Final.jar", "sha1": "%corespondent spa id%", "size": %change to file size%, "url": "https://libraries.minecraft.net/io/netty/netty-all/#.#.##.Final/netty-all-#.#.##.Final.jar"}}, "name": "io.netty:netty-all:#.#.##.Final"}"
I hope that everyone that is encountering this problem can find a fix
@Rengoku Tokisaki I'm truly sorry for the error you are currently encountering, did you follow any of the methods i'v given in my previous post and did any of them work. This problem is not the cause of mojang, but by the connection of either the server in which your trying to connect to or by your host machine or/and modems firewall. Netty's job is to authenticate your account to the server in which your trying to connect to, by sending two requests, one being to mojang's database where it finds info connected to your account(Stuff like your skin, name, uuid, token and other important info), the other being the server in which your trying to connect to, your host machine sends a request to that server looking for info like(whether or not you have permission to connect to the server("whitelist"), your inventory and other NBT data). and the reason you are unable to connect to the server is because the request sent by your host machine to the server, never reaches the server your trying to connect to, therefor the server your trying to connect to, never receives the required data to allow you to connect to the server. I hope that this helps in some way, and if it does not i hope you can find a way to fix this. - (IGN"TheGameDev"). Note: This is not a bug it is just an error
This error. For me at least was caused because my modem or/and router's firewall.
So i'v made some steps to hopefully help you:
(1.) Make sure you let minecraft through your host machines firewall. You can access your firewall by opening the integrated program "Windows Defender Firewall with Advanced Security." Then allow all "Java(TM) Platform SE binary" Rules by left clicking on the rule and clicking properties. Then if it is not already allowed. Toggle the rule action to "Allow This Connection" Also go into the advanced tab and check both Private and Public settings.
(2.) (if your router does not have a firewall just do your modem instead) Go into your router's or modem's control panel(The Layout May Vary) by entering 192.168.0.1 or 192.168.1.1 into a web address(this vary's depending if the ip address is connected to your router or modem) then find you firewall settings then add a rule with TCP and UDP selected then put in minecraft's default port witch is 25565 into the port start and port end then make sure you enable "Traffic In" and "Traffic Out".
(3.) Also make sure if you have a vpn to turn if off as it may cause this error
That is basically it i hope this helps anyone who encounters this error
All Minecraft and Java programs where allowed through the firewall
I fear that this can not be fixed by mojang as netty is owned by "the netty project" and I don't think mojang has the authority to modify their files, if anything the only onces who can fix this is "the netty project"(If it is fixable, as the problem is related to network problems not coding)