Connection Issues after 10-15 minutes

[Jason Marroquin]

    So here is what is happening. Students are able to log in and play on the server. Then for no reason about two thirds of them are booted out and can't rejoin unless they exit back to the main minecraft screen where they have the options for single player and multiplayer. If they try to connect before backing out all the way to that screen they are told that they can't join because they are joining a minecraftedu server and they are using regular minecraft client. Which is odd because all the clients were just using minecraft edu client before they were booted. This happens between usually around 10-15 minutes of game play and then again after another 10-15 minutes of game play.

Below is the section from the server that I see before a large group of students are booted.  Any thoughts or help would be appreciated.

"

[13:56:18]: NetworkDispatcher exception
java.io.IOException: An established connection was aborted by the software in your host machine
 at sun.nio.ch.SocketDispatcher.read0(Native Method) ~[?:1.8.0_66]
 at sun.nio.ch.SocketDispatcher.read(Unknown Source) ~[?:1.8.0_66]
 at sun.nio.ch.IOUtil.readIntoNativeBuffer(Unknown Source) ~[?:1.8.0_66]
 at sun.nio.ch.IOUtil.read(Unknown Source) ~[?:1.8.0_66]
 at sun.nio.ch.SocketChannelImpl.read(Unknown Source) ~[?:1.8.0_66]
 at io.netty.buffer.UnpooledUnsafeDirectByteBuf.setBytes(UnpooledUnsafeDirectByteBuf.java:436) ~[UnpooledUnsafeDirectByteBuf.class:?]
 at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:870) ~[AbstractByteBuf.class:?]
 at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:208) ~[NioSocketChannel.class:?]
 at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:87) [AbstractNioByteChannel$NioByteUnsafe.class:?]
 at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:480) [NioEventLoop.class:?]
 at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:447) [NioEventLoop.class:?]
 at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:341) [NioEventLoop.class:?]
 at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:101) [SingleThreadEventExecutor$2.class:?]
 at java.lang.Thread.run(Unknown Source) [?:1.8.0_66]
[13:56:18]: bettcy lost connection: TranslatableComponent{key='disconnect.genericReason', args=[Internal Exception: java.io.IOException: An established connection was aborted by the software in your host machine], siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:18]: bettcy left the game
[13:56:18]: Nayeli lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:18]: Nayeli left the game
[13:56:18]: noe lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:18]: noe left the game
[13:56:18]: Anthony lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:18]: Anthony left the game
[13:56:18]: kiana lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:18]: kiana left the game
[13:56:18]: misael lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:18]: misael left the game
[13:56:18]: vanessas lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:18]: vanessas left the game
[13:56:19]: daniela lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:19]: daniela left the game
[13:56:19]: edgar lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:19]: edgar left the game
[13:56:19]: victor lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:19]: victor left the game
[13:56:19]: jason5 lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:19]: jason5 left the game
[13:56:19]: melani lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:19]: melani left the game
[13:56:19]: izaac lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null}}
[13:56:19]: izaac left the game
[13:56:26]: Client protocol version 1
[13:56:26]: Client attempting to join with 13 mods : Comput...@1.74,lu...@5.1.0,TeNNoX_KeyAndCodeLock@1.4,ReiMi...@1.7.10,F...@7.10.85.0,custo...@1.7.10b,Fo...@10.13.2.1291,Bibli...@1.11.3,mc...@1.7.10,anima...@1.7.10,Back...@2.0.0,Computer...@1.74,m...@9.05
[13:56:26]: Attempting connection with missing mods [] at CLIENT
[13:56:26]: Disconnecting com.mojang.authlib.GameProfile@2fe13cfe[id=<null>,name=noe,properties={},legacy=false] (/192.168.110.94:49943): EduAliasProtectionPromptPassword
[13:56:26]: Failed to handle packet for /192.168.110.94:49943
java.util.NoSuchElementException: packet_handler
 at io.netty.channel.DefaultChannelPipeline.getContextOrDie(DefaultChannelPipeline.java:905) ~[DefaultChannelPipeline.class:?]
 at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:160) ~[DefaultChannelPipeline.class:?]
 at io.netty.channel.DefaultChannelPipeline.addBefore(DefaultChannelPipeline.java:153) ~[DefaultChannelPipeline.class:?]
 at cpw.mods.fml.common.network.handshake.NetworkDispatcher.insertIntoChannel(NetworkDispatcher.java:119) ~[NetworkDispatcher.class:1.7.2]
 at cpw.mods.fml.common.network.handshake.NetworkDispatcher.serverToClientHandshake(NetworkDispatcher.java:112) ~[NetworkDispatcher.class:1.7.2]
 at cpw.mods.fml.common.network.internal.FMLNetworkHandler.fmlServerHandshake(FMLNetworkHandler.java:60) ~[FMLNetworkHandler.class:1.7.2]
 at net.minecraft.server.network.NetHandlerLoginServer.func_147326_c(NetHandlerLoginServer.java:114) ~[nn.class:?]
 at net.minecraft.server.network.NetHandlerLoginServer.func_147233_a(NetHandlerLoginServer.java:63) ~[nn.class:?]
 at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:215) ~[ej.class:?]
 at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165) [nc.class:?]
 at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:727) [MinecraftServer.class:?]
 at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:356) [lt.class:?]
 at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:615) [MinecraftServer.class:?]
 at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:494) [MinecraftServer.class:?]
 at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:754) [li.class:?]
[13:56:26]: com.mojang.authlib.GameProfile@25647eb6[id=6629e15c-8bc9-37ac-aa30-b4a4d92c4d74,name=noe,properties={},legacy=false] (/192.168.110.94:49943) lost connection: EduAliasProtectionPromptPassword
[13:56:26]: [Server thread] Server side modded connection established

"

[EduElfie]

Does the same thing happen with a clean install, no mods?

You have a few mods there, some I have not heard of from other teachers or that have been rigorously tested. So I would suggest that it is a mod incompatibility that is causing your issue. If a clean installed server without any mods does not have the same issue I would then try adding the mods back in one at a time, that might help diagnose the mod that is causing the issue.

If a clean server does have the issue, then it is likely a network issue, but the clients erroring with that message would be very odd if it was just a network issue.

I will also bring this to the attention of the devs to see if they can shed some light on what might cause the issue.

Elfie.

[13:56:26]: Client attempting to join with 13 mods : Comput...@1.74,lu...@5.1.0,TeNNoX_KeyAndCodeLock@1.4,ReiMi...@1.7.10,F...@7.10.85.0,custo...@1.7.10b,Forge@10.13.2.1291,Bibli...@1.11.3,mc...@1.7.10,animalbikes@1.7.10,Back...@2.0.0,Computer...@1.74,m...@9.05

"

[Jason Marroquin]

thanks for the reply. This also is the same experience on clients with no mods. And it's never the same cluster of clients that get disconnected. If it is a network issue any ideas? Our school has an access point in every classroom but all have the same SSID so there is no one way to have them all connect to a single one. So the students in my class may be connecting to the class next door and vise verso.

[EduElfie]

Just to be clear, the server also has not mods installed right? Those disconnects are 'server' based, not student based from what I read, so make sure the server has no mods too, if it still happens we will look further.

Elfie.

[Robijn Vogel]

What Java version(s) do you have installed on your computer(s)?