I put a number of servers into maintenance mode in Operations Manager 2007 today for some work. When I terminated the maintenance mode setting a few of the servers stayed in a “Not Monitored” status in the OpsMgr Operations Console. I rebooted one (because it’s service could tolerate 1 node being offline) and that sorted it out. However, I couldn’t reboot any of the others.
The “Not Monitored” status usually means that the agent could not authenticate with the Management Server. Strangely, I got no errors in the agent’s Operations Manager log. The agent also had a green tick in the console. After having dealt with a strange certificate issue in the past I knew there were two services to worry about on the agent machine:
- Cryptographic Services
- OpsMgr Health Service
Here’s how I reset the secure channel on the agent machine:
- I put the agent machine into maintenance mode
- I stopped the Cryptographic Services service
- I stopped the OpsMgr Health Service service
- I started the Cryptographic Services service
- I started the OpsMgr Health Service service
- I terminated maintenance mode for the agent machine
Within a minute it was back to normal and being completely monitored again.