VNC session turns undead over the weekend

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http://unix.stackexchange.com – During the week I have a single VNC session I'm working with throughout the week. However, whenever I come back from the weekend or some vacation, I can no longer connect to that session, getting a "cannot connect to host: Connection refused (10061)". When I ssh to the server and use vncserver -list, I do see my session there, and it looks very much alive; and I can open additional sessions and connect to them. If I try to vncserver -kill the original session, though, I get a Xvnc process ID $ID already killed message. What's going on here, and I can I keep my session alive over time? Se (HowTos)