Systems become unmanaged

[ccastbr]

What is the mechanism that causes multiple systems that were being managed by the ePO to become unmanaged?      

Is this a symptom of communication issues, DNS issues, or other?

There are a large amount of agents reporting as unmanaged and showing in rogue, however, they were previously working.    Tried reinstalling the agent from the ePO and also manually without success. Also tried removing the record from the system tree and then reinstalled the agent.   Restarted the ePO.

I am looking for a good troubleshooting and repair path. 

[cdinet]

They don't become unmanaged necessarily.  That would appear to be the case if a system is removed from epo and then fails to check back in, or active directory sync re-adds system object.  It would appear as unmanaged and could represent a duplicate entry of the system.  So when did issue start and what changed?  You might need to open a ticket with McAfee, as we would need to see server and client logs to see what is going on.  Those logs would contain too much sensitive info to post here, which you should not do.

[ccastbr · Accepted solution]

The problem has been solved.    The agent-server key was not set as "master" - no key was set as master.     Fixed the issue.   unknown why this server was not set up properly.

[cdinet]

Glad you found that!  That is no a very common scenario.