Xvnc/Xnest/Xvfb can't create a socket in /tmp/.X11-unix.
The permissions to the /tmp/.X11-* directories have been restricted
for security reasons.
In order to still run unprivileged programs such as Xvnc/Xnest/Xvfb,
you need to start those programs with the "-pn" option.
You can no longer use displays of the form ":<num>"; only
displays with the full hostname will still work: "<hostname>:<num>".
The Solaris 9 versions of Xnest/Xvfb are able to create these sockets
as they also run set-gid.
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