RealVNC server not connecting locally after update from 20.10 to 21.04

[Gilles Gravier]

Hi!

On 27/04/2021 00:59, Karl Auer wrote:
> On Mon, 2021-04-26 at 18:32 +0200, Gilles Gravier wrote:
>> Have you verified that the VNC server is actually running?
>> Yes. It is. RealVNC accepts both local and cloud connections. On my
>> machine, I can connect through cloud, but not locally from the same
>> LAN. It almost looks like there's some strange firewall rule that is
>> dropping the packets (but that even from the same host so maybe an
>> application level firewall?)....
> You have shown that nothing is listening on the expected port on the
> expected interface of the expected host. It's not a firewall or packet
> filter of any kind.
>
> Right now my best guess is that the RealVNC you have installed either
> does not support or is not configured to handle local connections.
>
> But it's just a guess.
>
> There are probably logs somewhere you could inspect for clues. Google
> may throw up clues too.
RealVNC server has diagnostic logs... but it doesn't even show the
connection attempt. Almost as if Linux was blocking it, like with an IP
Filter or something...


Gilles