I have a win 2k server DC that is not the Operations Master or FSMO just an additional domain controller. I was able at one time to run AD replication monitor after installing Support Tools on this machine. Now I cannot, as it will not run , start or do anything. Th other DC runs this just fine and I see no replication errors on either. No symptoms of a problem either. I just periodically run replmon to check up on things as a method of maintenance. nbtstat shows no problems as neither does dc diag or net diag. Any thoughts on why it will not start? I am a stickler on things being correct and would in a heartbeat demote the puppy and redo the AD on this machine, but wanted to see if any one had any thoughts on this nuisance. I have copied replmon.exe back from a known good copy just to make sure that it didn't get hammered.