Ok, here's a (hopefully) good development: I just casually let a container displaying on the X server run on my local machine, went away, the machine went in standby and:
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Excatly the same log messages and apparently the same window popping up!
So it all seems due to a lost internet connection and having to confirm a re-login request..
I wonder what's the equivalent of the standby causing the disconnection on my local machine is on the remote server, but that can easily be found out,a nd I have a problem to solve now.
If this is now sorted, I hope it'll be useful for someone ending up in the same trap.
Thank you Jürgen for the quick help.
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Renato
