MOM 2005 - removing old agents from Database
If you have some agents that you definitely removed from your management group by MOM admin console, manually or through the ResKit tool "Cleanup MOM" AND they still re-appear in the MOM console, then try this script:
https://www.huntland.co.uk/Downloads/MOM/RemovingUnwantedMachineEntries.html
(remember to backup your DB of course)
If the agent that always re-appears is a domain controller then remember to delete that agent also from this AD container: CN=MOMLatencyMonitors,DC=ForestDnsZones,DC=ad,DC=pkobp,DC=pl
It's a forest-wide application partition, to delete the computer from that container you can use LDP.exe/adsiedit.msc or any AD editing tool. BTW a great set of free AD tools you will find here: