Error on join: Can't serialize unregistered packet

[SillyPutty125]

I am trying running a server with the recommended build of Forge for 1.12.2, and no mods. It seems to work when I join server for the first time, but after I disconnect I am unable to reconnect. The server outputs the following when I try to reconnect:

[Server thread/INFO] [minecraft/NetHandlerPlayServer]: SillyPutty lost connection: Internal Exception: io.netty.handler.codec.EncoderException: java.io.IOException: Can't serialize unregistered packet

I can run a server for 1.8.9 with mods without any issues, but can't seem to get this version to work. Any ideas on how I can resolve this issue? Thanks!

 

Forge version: forge-1.12.2-14.23.5.2768 (also tested with 2775)

debug.log

[SillyPutty125]

Sometimes I'm able to get: 

  Quote

java.io.IOException: An established connection was aborted by the software in your host machine

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when I disconnect after my first connection. I still get the same error when I try to reconnect. Here's the log file

 

Also, I should add that this problem does not exist for vanilla minecraft servers. If I run the "minecraft_server.1.12.2.jar" that comes with the forge executable file, everything works fine. The problem is specific to forge, and it's on the server side. My java is updated, and I can connect to the server on the same computer using my LAN IP address, or from a different computer. I'm just not sure what to try next.

 

EDIT: Here's one more log where I was able to connect twice before it stops letting me in.

 

Edited November 21, 2018 by SillyPutty125
extra log

[Cadiboo]

You could start an issue on the Forge GitHub if you think this is a real bug (which it seems to be)

 

Do you have any mods or anything installed? How are you running the sever? 

[SillyPutty125]

No mods except for forge. I'm running the server with the following batch file:

java -Xms512M -Xmx4096M -d64 -jar forge-1.12.2-14.23.5.2768-universal.jar nogui
pause

 

I'll open an issue on GitHub if people are confident I'm not doing something stupid.

[Cadiboo]

You should probably do a little bit more digging first.

Do you have any other networking related stuff going on on your network/computer? Are you port forwarding your sever?

Most importantly, does it work on another machine or account?

[SillyPutty125]

  On 11/21/2018 at 8:28 AM, Cadiboo said:

Do you have any other networking related stuff going on on your network/computer? Are you port forwarding your sever?

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I'm behind a router, but I have port forwarding setup (works perfectly for 1.8.9). The problem exists regardless of whether I connect to my router's IP, or my computer's IP (192.168.0.2)

 

  On 11/21/2018 at 8:28 AM, Cadiboo said:

Most importantly, does it work on another machine or account?

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Yeah, it's at least somewhat unique to my machine. I had a friend test it out on a different machine/network/account and it worked fine. I can personally test it out on another machine tomorrow.

[quadraxis]

Try adding -Dforge.logging.mojang.level=debug to the server run arguments (and possibly also your client JVM arguments) and then supply a debug.log file with that setting enabled to get more info than just "Can't serialize unregistered packet".

Edited November 21, 2018 by quadraxis
update

[SillyPutty125]

  On 11/21/2018 at 9:43 AM, quadraxis said:

Try adding -Dforge.logging.mojang.level=debug to the server run arguments (and possibly also your client JVM arguments) and then supply a debug.log file with that setting enabled to get more info than just "Can't serialize unregistered packet".

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Here's my log for the server with debugging turned on. I'll get back to you on the debug logs for client side. 

[SillyPutty125]

Here's the log from the client side

[SillyPutty125]

I tested with other computers yesterday. The problem is definitely with running a server on this particular computer (running windows 7). I can't reproduce the problem with a server on another machine.

 

To summarize:

• I have a machine that cannot host a 1.12.2 minecraft server using forge (no mods), but it can host 1.12.2 vanilla and 1.8.9 forge/vanilla without issue.
• The error message is "Can't serialize unregistered packet" when attempting to join the server from any machine. The client only sees "Disconnected: Failed to connect to the server."
• Joining the server always works the first time after server startup, and almost always fails the second time. After failing to join once it always fails every subsequent attempt.
• Java is up to date, and the server is running the latest recommended build of forge. (forge-1.12.2-14.23.5.2768)
• The problem persists with firewalls and antivirus disabled.
• I have port forwarding setup properly, though tests have also be performed on a LAN.

Here's a snippet from the server debug.log:

[02:14:48] [User Authenticator #2/DEBUG] [com.mojang.authlib.HttpAuthenticationService]: Opening connection to https://sessionserver.mojang.com/session/minecraft/hasJoined?serverId=-51d4d3928be0b8be72f5948347df120e37886337&username=SillyPutty
[02:14:48] [User Authenticator #2/DEBUG] [com.mojang.authlib.HttpAuthenticationService]: Reading data from https://sessionserver.mojang.com/session/minecraft/hasJoined?serverId=-51d4d3928be0b8be72f5948347df120e37886337&username=SillyPutty
[02:14:48] [User Authenticator #2/DEBUG] [com.mojang.authlib.HttpAuthenticationService]: Successful read, server response was 200
[02:14:48] [User Authenticator #2/DEBUG] [com.mojang.authlib.HttpAuthenticationService]: Response: {"id":"f1dd241ea1c84b5eaede23924d8c2017","name":"SillyPutty","properties":[{"name":"textures","value":"eyJ0aW1lc3RhbXAiOjE1NDI3OTUyODU5MDcsInByb2ZpbGVJZCI6ImYxZGQyNDFlYTFjODRiNWVhZWRlMjM5MjRkOGMyMDE3IiwicHJvZmlsZU5hbWUiOiJTaWxseVB1dHR5IiwidGV4dHVyZXMiOnsiU0tJTiI6eyJ1cmwiOiJodHRwOi8vdGV4dHVyZXMubWluZWNyYWZ0Lm5ldC90ZXh0dXJlLzg4YzU2OTY1YjVkOTQyZDliMmQ2NDdkMDc1NWRiNWJlM2UwNzRjMDE3ZjMyOGEzMTRiOGI0MzIwZTgxOWJjYTEifX19","signature":"av4d8TMCHZ8EfkiJPyCwKvraZNqyKQ20pGOG2nEDuWDnyPAXbTTuKQlOhI2cUURvkIhaVAjr2Wvkzq7J/nd0tXLqWukd0APcNYdAZX2bYxenwx2XRNnYXW26HkgOWLp/fxTGHCOsGEKP073tLpXkBcbP+qdNqNxYxjy6Qyptk0xAZEObW7Z89XTfjcXc1Z9QHnoaRQZvSxiOUZyi5zAnqoRZNIsBCm9LftrQHSkSpuNS3xn2sigdWjvCbMN5ptiZ6UCzSiN6Xw2yDDOo8SOY0aqWLd+4KB3X1Uk5rALPOg/nol5Wrt7Ds2zPCofb+veQoR1G8NwH3oVTAr08zrFpJE/TQTkzac6bIqz2RvfeqG9QhP0czU2W4xL1XgE5EmRNjVgMzH6NpwvhBZdmp/uARUkBhMq7Bywm0rBUKdizD+di9m6ADoYfdU/3uP1xe5ZUt50EDHj/wGm69iO1JSei+WUZiR86hgBkLN1vde/zB8GDMsWyCcCJGwcg99l56P+mTfJczawNh1AikSfeUoAG8212yZpdrJuOOO30jJ0tjykK4eaFkCXuKxl4mmcdtrO5zTpwcQ8Hd0Vbg6ttwBOFabQFjIbxPyBLNCsV0STdxaIIXkyf1zoAfBhH5u14B9U9esVmZay1iFn9mfsZ2q0F3N2iG1qZuFMQ+xHHzbXDTmg="}]}
[02:14:48] [User Authenticator #2/INFO] [net.minecraft.server.network.NetHandlerLoginServer]: UUID of player SillyPutty is f1dd241e-a1c8-4b5e-aede-23924d8c2017
[02:14:48] [Server thread/TRACE] [FML]: Handshake channel activating
[02:14:48] [Server thread/DEBUG] [FML]: FMLHandshakeServerState: null->FMLHandshakeServerState$1:START
[02:14:48] [Server thread/DEBUG] [FML]:   Next: HELLO
[02:14:48] [Server thread/DEBUG] [net.minecraft.network.NetworkManager]: Set listener of net.minecraft.network.NetworkManager@5ab9cdf5 to net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1@1b71594
[02:14:48] [Server thread/DEBUG] [net.minecraft.network.NetworkManager]: Enabled auto read
[02:14:48] [Netty Server IO #5/DEBUG] [net.minecraft.network.NetworkManager]: Internal Exception: io.netty.handler.codec.EncoderException: java.io.IOException: Can't serialize unregistered packet
io.netty.handler.codec.EncoderException: java.io.IOException: Can't serialize unregistered packet
	at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:125) ~[MessageToByteEncoder.class:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:738) ~[AbstractChannelHandlerContext.class:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:801) ~[AbstractChannelHandlerContext.class:?]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814) ~[AbstractChannelHandlerContext.class:?]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794) ~[AbstractChannelHandlerContext.class:?]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:804) ~[AbstractChannelHandlerContext.class:?]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814) ~[AbstractChannelHandlerContext.class:?]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794) ~[AbstractChannelHandlerContext.class:?]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:831) ~[AbstractChannelHandlerContext.class:?]
	at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1032) ~[DefaultChannelPipeline.class:?]
	at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:296) ~[AbstractChannel.class:?]
	at net.minecraft.network.NetworkManager$4.run(NetworkManager.java:245) [gw$4.class:?]
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) [AbstractEventExecutor.class:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403) [SingleThreadEventExecutor.class:?]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:442) [NioEventLoop.class:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858) [SingleThreadEventExecutor$5.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_191]
Caused by: java.io.IOException: Can't serialize unregistered packet
	at net.minecraft.network.NettyPacketEncoder.encode(NettyPacketEncoder.java:42) ~[ha.class:?]
	at net.minecraft.network.NettyPacketEncoder.encode(NettyPacketEncoder.java:12) ~[ha.class:?]
	at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107) ~[MessageToByteEncoder.class:?]
	... 16 more

 

Does anyone have any ideas on what I should check/try next?

[Cadiboo]

This thread might be useful, try using 64 bit Java (you have 86 bit 1.8.0_191 and are running it on a 64-Bit Server VM).

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

Edited November 24, 2018 by Cadiboo

[SillyPutty125]

  On 11/24/2018 at 2:53 AM, Cadiboo said:

This thread might be useful, try using 64 bit Java (you have 86 bit 1.8.0_191 and are running it on a 64-Bit Server VM).

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

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Thank you! I was able to fix the problem by uninstalling my 32 bit Java, forcing it to use the 64 bit version. I don't know why it was using the 32 bit version to begin with!