X11 no longer working

[Richard Tobin]

> Launching X11 manually ./X11 is a good point. Did that and XQuartz
> appears in the dock. Firing then xclock on the Target doesn't do
> a connection. Silence. The xclock just hangs there.

Does running xclock or other X clients locally work?

If it does, X is listening on the unix socket as expected and the
problem must be with ssh connecting to it.  What X-related lines
does /etc/ssh/ssh_config have?

-- Richard

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