So I've been working on getting all the Mac Workstations setup to use ARD at the college that I work for. I ran ARD on our Xserve to search for and capture all the Macs in one of our labs. But since then I haven't been able to remote into the Xserve. I keep on getting the following error.

An administration application is currently running on this computer and will not allow you to remotely control the screen

Well that stinks! Now I have to go way up to the computer room and see what is going on. Or do I? Heck no! I figured that the "administration application" that was currently running must have been ARD. So I can just kill it from the command line. So I ssh'd into the server and ran:

ps aux |grep Remote

That lists anything running with the word Remote in it. ARD is listed as "Remote Desktop". So I copied its PID number and ran:

kill -9 [PID of Remote Desktop]

Then I could once again remote control the Xserve from my desktop. However I wanted to make sure I wouldn't have to go through this all again. So I started poking through the preferences of ARD. Under "Security" I found a check box called "Allow control of this computer when this application is running". I checked it and now I can remote into the Xserve just fine again.

I love ssh!