So I have a bit of a weird thing here. I was testing Forefront with MOM 2005 and WSUS and ran into a problem. One of the computers I was testing with had to be re-imaged due to a failed SP update. Because of this, I had to delete it from the domain, and not unjoin it.
When I re-imaged the machine and joined it to the domain, I used the same hostname (we use the service tag as the hostname). Apparently, WSUS did not like this as it thought it was already current with updates. I changed the hostname in order for WSUS to push the updates to the client (which also included FF and MOM 2005) and everything seemed fine. That is, until I changed the hostname back to our standard.
The hostname change does not reflect in the MOM console, and I can't seem to get it to. I've tried rediscovering attributes, I tried unjoining and rejoining the domain. Everything short of uninstalling the agent and reinstalling it. Is that really the route I have to go, when I need to rename a computer?
Delete the system from the MOM administration console.
On the client
I've done the above, and it works. The only weird thing is that it didn't pull the AD description of the client computer, it's just blank, but that's a different problem.