Looking for troubleshooting direction x11vnc

[gandsnut]

On my home network, I have an Ubuntu 22.04 daily-driver system (ethernet) named 'hpsystem'. There's a Linux Mint 21.1 in another room, (wireless 5g) named 'dellsystem'. The router is at 192.168.1.1 supplying IP's.

I'm at the point where on 'dellsystem' (in a terminal window) I issue "x11vnc -display :0 &". There is an x11vnc GUI program that appears to allow configuration. I've looked for log files, but can't find any.

On 'hpsystem', I use Remmina client to open a remote desktop connection to 'dellsystem', which on FIRST TRY works fine. That connection seems to stay live as long as I need. When done, I disconnect the Remmina link to 'dellsystem'.

Any following attempt to do the above produce "Unable to connect to VNC server"

On 'dellsystem', I use a terminal command "x11vnc -R stop", which stops the server. If I run through all the above steps from the beginning, the ability to do a RDS works fine, ONCE.

I'm not sure how to go about diagnosing this situation. I didn't think I'd have to go to the remote system every time I disconnect from the main system, to restart x11vnc. Thanks.