Hello.

What is your host OS?
What version of Guacamole?
What version of TightVNC?

Here on Ubuntu 20.04.6 LTS+Guacamole 1.5.1+TightVNC 2.8.75, I've tried 
connecting and disconnecting repeatedly with no errors.

Best Regards,


On 2023/04/18 火 午後 08:44, Carolin Baumgartner wrote:
Hi all

I have an annoying issue with my guacamole / tightvnc setup. I can connect to 
my system only once. If the connection dies for whatever reason (usually 
hibernation of system running the browser client), I cannot reconnect to the 
VNC connection w/o restarting vncserver.

I can connect to guac, but when I try to resume the VNC connection I see an 
error. When I check syslog on the server, I see the following:

"List of security types is ZERO, expecting an error to follow"

I have to restart vncserver to reconnect.

Is that a guac issue or rather a tightvnc one? Any ideas? Is there any more 
information needed from my side to debug?

best regards
Carolin

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