RealVNC server not connecting locally after update from 20.10 to 21.04

[Gilles Gravier]

Hi!

I upgraded Ubuntu from 20.10 to 21.04. I updated VNC Server to 6.7.4 64
bits. I stopped Wayland to use Xorg.

I can connect from cloud to my machine but when I connect to the
configured port from LAN, I get a connection refused. Even if I telnet
localhost 5900 ...

Any idea what is going on?

Maybe some newfangled VNC server already listening on 5900 that I would
need to shut down? Or some new firewall rule blocking port 5900?

Any help appreciated!

Gilles

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