Worked before but not now.

I am running ARD 3 in my computer lab of eMacs. the current status of all but one of the computers is offline. But the computers are on. They worked a couple weeks ago but all of a sudden they arent. Please help. Also some of my IP addresses have changed to 0.0.0.0 WHAT IS GOING ON??? PLEASE HELP!!!
I EVEN HAVE TWO COMPUTERS THAT THE CURRENT STATUS IS UNKNOWN??
Not sure what to do. or why its happening. Thanks.

Ok...this worked for me, so maybe it will solve your problem too.
1. Login to the local administrator account on the computer.
2. Go to /Library/Preferences
3. Delete the following 3 files:
com.apple.ARDAgent.plist
com.apple.RemoteDesktop.plist
com.apple.RemoteManagement.plist
4. Empty the Trash
5. Restart Computer.
6. Now you should be able to see the machine via ARD, however, mine showed as having the "old version" of the client, so I pushed out the update and all is well.
I hope this helps.

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