$ xinit tmp/testinit -- /usr/bin/Xnest :5

AUDIT: Mon Jul 16 06:00:00 2007: 11786 Xnest: client 1 rejected from local host (uid 1000)
No protocol specified

waiting for X server to begin accepting connections .
AUDIT: Mon Jul 16 06:00:02 2007: 11786 Xnest: client 1 rejected from local host (uid 1000)
No protocol specified
..
AUDIT: Mon Jul 16 06:00:04 2007: 11786 Xnest: client 1 rejected from local host (uid 1000)
No protocol specified
..
AUDIT: Mon Jul 16 06:00:06 2007: 11786 Xnest: client 1 rejected from local host (uid 1000)
No protocol specified
..
AUDIT: Mon Jul 16 06:00:08 2007: 11786 Xnest: client 1 rejected from local host (uid 1000)
No protocol specified
..
AUDIT: Mon Jul 16 06:00:10 2007: 11786 Xnest: client 1 rejected from local host (uid 1000)
No protocol specified
..
AUDIT: Mon Jul 16 06:00:12 2007: 11786 Xnest: client 1 rejected from local host (uid 1000)
No protocol specified