Joining LAN server results in timeout

[Guanran928]

Bug Description

I cannot join my LAN server, after I double-clicked on my server, my client is stuck on the "Joining" screen, my server sees my client joins for *exactly* 30s, then `Timed out`

I am able to join my server sometimes, normally I need to re-join 4-5 times.

Did this behavior use to work in the previous version?

Untested

Steps to Reproduce (for bugs)

1. Join SF4 server
2. Wait for ~30s
3. Disconnect with one of the following messages:

• Timed out
• Disconnected
• io.netty.channel.unix.Errors$NativeIoException: syscall:write(..) failed: Broken pipe

Logs

• Client/Server Log:
  server latest.log: https://fars.ee/2iFA
  server latest.log, second boot: https://fars.ee/9M8S

  client latest.log: https://fars.ee/PL_a
  (io.netty.channel.unix.Errors$NativeConnectException: syscall:getsockopt(..) failed: Connection refused should be when I accidentally quitted Zellij, then the server shuted down)

• Crash Log: n/a

World Information

• World Preset: SkyFactory4
• Prestige Enabled: No
• Modpack Version world created in: 4.2.4
• Additional Content Installed: None

Client Information

• Modpack Version: 4.2.4
• Java Version: OpenJDK 8u362

openjdk version "1.8.0_362"
OpenJDK Runtime Environment (build 1.8.0_362-ga)
OpenJDK 64-Bit Server VM (build 25.362-bga, mixed mode)

• Launcher Used: Prism Launcher 8.2
• Memory Allocated: 6000MiB
• Server/LAN/Single Player: LAN server
• Optifine Installed: No
• Shaders Enabled: No

Server Information

• Java Version: Temurin 8u392, with Aikar's flags

openjdk version "1.8.0_392"
OpenJDK Runtime Environment (Temurin)(build 1.8.0_392-b08)
OpenJDK 64-Bit Server VM (Temurin)(build 25.392-b08, mixed mode)

• Operating System: Linux, NixOS
• Hoster/Hosting Solution: Selfhosted
• Sponge (Non-Vanilla Forge) Server: No

[Guanran928]

Is this related to JEI? I created a new client instance that was working fine, syncing JEI(?) takes ~25s (06:58:09 to 06:58:34) on the old instance, and 4s (07:26:29 to 07:26:33) on new instance

[Guanran928]

It started showing up again on the new instance

[sam-kirby]

Have you tried extending the timeout? You can modify it by setting the property fml.readTimeout, for example by adding the following flag to your server arguments: -Dfml.readTimeout=60. It defaults to 30, units are seconds.

Note that this flag must be added before -jar to have any effect.

[Guanran928]

Have you tried extending the timeout? You can modify it by setting the property fml.readTimeout, for example by adding the following flag to your server arguments: -Dfml.readTimeout=60. It defaults to 30, units are seconds.

Thanks, will try that when I got home.

[Guanran928]

Hmm. I'm still getting timeouts

Here is my entire jvm flag:

#!/usr/bin/env bash
nix run nixpkgs#temurin-bin-8 -- -Xms4G -Xmx4G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true -Dfml.readTimeout=120 -jar forge-1.12.2-14.23.5.2860.jar nogui

server latest.log: https://fars.ee/1qyR

my server sees my client joins for exactly 30s, then Timed out

Now it seems to be 15s for some reason?

[20:31:21] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: Guanran928 joined the game
[20:31:37] [Server thread/INFO] [net.minecraft.network.NetHandlerPlayServer]: Guanran928 lost connection: Timed out

[20:38:10] [Server thread/INFO] [minecraft/DedicatedServer]: Guanran928 joined the game
[20:38:26] [Server thread/INFO] [minecraft/NetHandlerPlayServer]: Guanran928 lost connection: Timed out

EDIT: 🤦 it is 15s since the beginning...

[sam-kirby]

It's 30 seconds in the first log you provided:-

[06:46:16] [User Authenticator #49/INFO] [net.minecraft.server.network.NetHandlerLoginServer]: UUID of player Guanran928 is 86dbb6c5-8d8b-4c45-b8eb-b3fdf03bfb27[06:46:17] [Netty Epoll Server IO #11/INFO] [FML]: Client protocol version 2
[06:46:17] [Netty Epoll Server IO #11/INFO] [FML]: Client protocol version 2
...
[06:46:46] [Server thread/INFO] [net.minecraft.network.NetHandlerPlayServer]: Guanran928 lost connection: Timed out
[06:46:46] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: Guanran928 left the game

And 36 seconds in the new log:-

[20:31:01] [User Authenticator #1/INFO] [net.minecraft.server.network.NetHandlerLoginServer]: UUID of player Guanran928 is 86dbb6c5-8d8b-4c45-b8eb-b3fdf03bfb27
[20:31:01] [Netty Epoll Server IO #2/INFO] [FML]: Client protocol version 2
...
[20:31:37] [Server thread/INFO] [net.minecraft.network.NetHandlerPlayServer]: Guanran928 lost connection: Timed out
[20:31:37] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: Guanran928 left the game

[sam-kirby]

So it seems to have increased it, but not by as much as is specified.

You could try adding Random Patches to your server - one of the many patches it includes extends both the login and read timeouts to (by default) 90 seconds but you can configure it further if necessary.

[sam-kirby]

Closing as stale