Computer Cannot be managed

When I try to manage a domain computer through my active directory snap-in, I get the following error message:

"computer cannot be managed. null"

My domain admin is a member of the local computer's admin group. Also, I've tried both ways have having the firewall on the computer turned off, by a gpo and without a gpo.

Any thoughts or ideas?

The client computer is a Vista SP1 and the active directory controller is a Win2008 server.
Who is Participating?
Jason WatkinsIT Project LeaderCommented:
Is the network management exception added to the server's firewall as well?
Mike KlineCommented:
The firewall was going to be my first suggestion but you already tried that.
Try some of the other steps outlined here:
Another thing I would do is load wireshark or netmon and look at the network trace.  That may help you trace what is happening.
 Can you manage it if you try to connect to it via IP address?
fastcar8083Author Commented:
Thanks for that link. I was able to ping it by name, however the name doesn't exist as an A record in my dns server. When I tried to connect by ip address it worked.
Jason WatkinsIT Project LeaderCommented:
Thanks for the points!

Make sure the client's NIC is set to register it's IP address in DNS, and that your DHCP server is set for dynamic update.
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