Okay, i think i got it. I am able to unlock the dialog through a ssh 
connection, i assume that it will be the same for remote X.

Apply this patch: 
http://launchpadlibrarian.net/39471473/polkit-systemtools-remote-allow.patch
# sudo cp -a 
/usr/share/polkit-1/actions/org.freedesktop.SystemToolsBackends.policy 
/usr/share/polkit-1/actions/org.freedesktop.SystemToolsBackends.policy.ori
# sudo patch 
/usr/share/polkit-1/actions/org.freedesktop.SystemToolsBackends.policy 
polkit-systemtools-remote-allow.patch

Then kill polkitd, it will be restarted automatically when you open the 
user-manage dialog again:
# sudo pkill polkitd



Jakob

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