Problem(s) Encountered:

Lost the remote connection and couldn''t get back in because x11vnc stopped working.  It first offered port 5901 instead of 5900, but I didn''t know how to use that, and eventually x11vnc didn''t even get that far.

Solutions:

Some comments on x11vnc.  If you see a new port number, you probably have another vnc service still running.  A killall x11vnc and killall Xvnc might help (or reboot if feasible).  In addition, it’s always a good idea to reboot the client machine from where the ssh tunnels originate.  

One last comment you can use x11vnc on other port numbers but the ssh tunnel used must be changed to match that port number (the right hand side number of the tunnel config must match what is reported by

Vnc). (David Will)