RealVNC server not connecting locally after update from 20.10 to 21.04

[Gilles Gravier]

Hi!

On 27/04/2021 01:50, Little Girl wrote:
> Hey there,
>
> 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?)....  
> Sorry to jump in at this point, but I seem to have missed this
> message when it came through. What does "but not locally from the
> same LAN" mean, specifically? There wouldn't happen to be virtual
> machines involved here, would there?

No VMs involved. :) On my Ubuntu laptop I run RealVNC in service mode.
On that same laptop I can't run vnc-viewer localhost:5900 or telnet
localhost 5900
>From another machine on the LAN I can't run vnc-viewer MyLaptop:5900 or
telnet MyLaptop:5900

But I can connect to it using ReaVNC's cloud services.

And on the app's options, I have enabled local service on port 5900. In
fact it was working that way on Ubuntu 20.10... it just stopped after
upgrading to 21.04... no other parameters changed.


Gilles