MC-271325Server attempts to send disconnect packets in the status phase
Clients invalidly handling their connection during the status phase will cause a SocketException to be thrown, which is handled by the ClientConnection#exceptionCaught method. This results in a clientbound/minecraft:disconnect packet with the message 'Internal Exception: (stringified error)'to be sent to the client. However, this packet doesn't exist in the status phase, so the server logs the following exception:
Error sending packet clientbound/minecraft:disconnect
io.netty.handler.codec.EncoderException: Sending unknown packet 'clientbound/minecraft:disconnect'
I would expect this exception to not be thrown as sending a disconnect packet with text during the status phase makes no sense, and the true error is with the client rather than the server.
Linked Issues
Created Issue:
Server attempts to send disconnect packets in the status phase
Clients invalidly handling their connection during the status phase will cause a SocketException to be thrown, which is handled by the ClientConnection#exceptionCaught method. This results in a clientbound/minecraft:disconnect packet with the message 'Internal Exception: (stringified error)'to be sent to the client. However, this packet doesn't exist in the status phase, so the server logs the following exception:
Error sending packet clientbound/minecraft:disconnect io.netty.handler.codec.EncoderException: Sending unknown packet 'clientbound/minecraft:disconnect'I would expect this exception to not be thrown as sending a disconnect packet with text during the status phase makes no sense, and the true error is with the client rather than the server.
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is duplicated by
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Affects 1.21.4.
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I attached log-2024-05-01.txt, it goes along with this packet capture file that was too large for me to upload: https://drive.google.com/file/d/1l1RAHCC_-rwh8S2B1PO3YecRxdpyFvO0/view?usp=sharing
The issue happens at the times
[21:55:41] packet 11267
[23:46:39] packet 14259
[00:11:10] packet 14940
[00:13:02] packet 14990
[02:41:30] packet 18900
[04:47:41] packet 22144
[05:33:36] packet 23300
Affects 24w20a.
Affects 24w21b.
Affects 1.21 Pre-release 2.
Seems like this is breach attempt from old exploit. When older version, you might observed log that says something like <known player> disconnected from <not matching IP address>.
Seems like this is some kind of side effect of patching that exploit (or just updating java version). I experienced server crash when server processing these kind of errors.
There seems to be a Fabric mod which implements a fix for this bug: Disconnect Packet Fix
Can anyone provide an update on this bug?
Happens on 1.21.3, on all Bukkit forks and Vanilla. This has been freaking me out for ages!
ServerOyster: 1.21.3 is outdated and no longer supported on this bug tracker. Please only confirm issues for the latest version (1.21.4+).
Also happens on 1.21.4
Also happens without any players currently being online, or recently disconnected:
Last player online left, then this error happens multiple times, here's one of them, no player activity since 01:03:41
Version: 1.21.4 (Fabric)