Found a solution which worked:
http://superuser.com/questions/279169/tmux-died-and-says-no-sessions-is-there-any-way-to-recover.
Sorry for the noise.
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WatchGuard Dimension instantly turns raw network data into actionable
Sorry if this is a dumb question but I couldn't find anything obvious
after searching online. I had a tmux session running on a Linux host
(inside a VNC session). I detached that tmux session, killed the VNC
server and started a new VNC server.
But a 'tmux ls' says 'failed to connect to server'. W
