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when trying to vnc to server again, get connection refused.

Both debian 8 machines. Server machine uses x11vnc and client machine uses xtightvncviewer.
I can vnc into the server one time. But if I close that connection and try to vnc again, it gives this error:

Code:

erik@myclientcomputer:~$ vncviewer 10.25.1.100

vncviewer: ConnectToTcpAddr: connect: Connection refused

Unable to connect to VNC server

erik@myclientcomputer:~$

To be able to vnc in again, I have to have to ssh in to the server and run x11vnc as the logged-in user and then I'll be able to vnc again.

Is there a way to make x11vnc always run in the background?

This is normal for x11vnc, it will exit after one connection then disconnect. Check the -forever option from the x11vnc man page, that will keep it running even after a disconnection.

I normally run x11vnc from inside screen so if my ssh session gets disconnected then x11vnc will continue to run