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https://issues.apache.org/jira/browse/GUACAMOLE-1877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17782918#comment-17782918
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Mike Jumper commented on GUACAMOLE-1877:
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You can turn on debug-level logging for guacd. That will allow the logs
"libvncclient" to be visible in the guacd logs, and those logs might have
information regarding the nature of the failure.
Unfortunately, the error you're seeing is not actually something due to
Guacamole itself; it's the underlying VNC library complaining that it couldn't
handle a message received from the VNC server, and so the connection is closed.
If it is a bug, it would be a bug in that library (libvncclient, part of
libvncserver).
> Disconnects over VNC on QEMU machines
> -------------------------------------
>
> Key: GUACAMOLE-1877
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1877
> Project: Guacamole
> Issue Type: Bug
> Components: guacd
> Affects Versions: 1.5.3
> Reporter: Nick Stocchero
> Priority: Major
>
> I am seeing regular disconnects from a QEMU VNC server from guacd. It seems
> to happen mostly during the boot process (ie when uefi hands off to the OS).
> I've tried a locally compiled version as well as the docker version of guacd.
>
> OS: Debian GNU/Linux 12 (bookworm)
> QEMU version: 1:7.2+dfsg-7+deb12u2
>
> Virtual Machine Definition:
> {{ <graphics type='vnc' port='40001' autoport='no' listen='0.0.0.0'>}}
> {{ <listen type='address' address='0.0.0.0'/>}}
> {{ </graphics>}}
> The guacd logs look like this (with log level debug)
> {{guacd[17]: INFO: User "@f3dbfd16-3ddf-42eb-9a49-07efdaf96134" joined
> connection "$779cca17-7293-4891-b13c-c9a9f153336c" (1 users now present)}}
> {{guacd[17]: DEBUG: Client is using protocol version "VERSION_1_5_0"}}
> {{guacd[17]: ERROR: Error handling message from VNC server.}}
> {{guacd[17]: INFO: Internal VNC client disconnected}}
> I'm a little bit lost where to start. Is there a way to get more info about
> that " Error handling message from VNC server."
> Thanks!
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