Weston Thayer created GUACAMOLE-2095:
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Summary: RDP audio intermittently not working because of missed
audio protocol instruction
Key: GUACAMOLE-2095
URL: https://issues.apache.org/jira/browse/GUACAMOLE-2095
Project: Guacamole
Issue Type: Bug
Components: guacd
Affects Versions: 1.6.0
Reporter: Weston Thayer
After upgrading to 1.6.0, I am experiencing about 15% of RDP connections
failing to play audio from the remote computer. My remote computers are all
Windows 10 and Windows Server (2019 through 2025), Windows version doesn't
appear to matter.
I've created a reproducible example at
[https://github.com/WestonThayer/bug-guacamole-noaudio]
I am not able to reproduce on 1.5.5 or 1.5.4 (at least with N=100 attempts).
I am using the official Docker images, which I realize contain other dependency
upgrades, so this may not be in Guacamole itself.
Inspecting suggests the root cause is that the web client never receives the
[audio instruction|
https://guacamole.apache.org/doc/gug/protocol-reference.html#audio-instruction]
over it's WebSocket with guacamole, so it doesn't reply confirming that a
stream was created, and subsequent audio blobs aren't sent for playback.
I added some logging to guacd which showed that
[raw_encoder_send_audio|https://github.com/apache/guacamole-server/blob/f3f5b9d76649ccc24f551cb166c81078f4b5e236/src/libguac/raw_encoder.c#L34]
is being called, but it seems to be dropped before making it to guacamole's
java.net.Socket.
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