xscope doesn't use Xlib. You need to just tell it what the "traditional" display is. Your best bet is just checking 'ps x' to see the arguments to /opt/X11/bin/X : jeremy 12366 0.0 0.0 2446148 848 ?? S 1:53PM 0:00.00 /opt/X11/bin/X :5 -dpi 96 Then use that to start xscope: /opt/X11/bin/xscope -i12 -o5 Somewhere else, run: DISPLAY=:12 xinput test pointer --- That being said, it looks like /opt/X11/bin/xscope gets hung up somewhere... I'm not sure why, but building from git and disabling USE_XTRANS in the generated Makefile gets us a usable xscope. --Jeremy On Apr 4, 2010, at 12:41, Tom Lane wrote:

I find that xscope just fails with Can't open connection to Server I tried disabling authentication and so on, but no change.

regards, tom lane

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