I have Windows Server 2008 machine (VM) that I joined to a active directory domain (the DC is a 2K8 machine as well). It appears that the machine is joined, and I can log in to the machine as a domain user. However, some other stuff isn't working. I can't remote desktop into the machine even as a domain admin (just doesn't accept the credentials at all), and I can't add SQL logins for domain users (SQL says the user can't be found).
I created the VM using a VHD that I previously exported from the Hyper-V snap-in, and it seems to work fine for the DC VM I created. But this second VM is causing me grief. Any ideas?
Are you sure the VM is still joined to the domain? Machines sometimes have their computer account details get out of sync when you start playing with VM images and replaying older instances of domain joined machines for example. Try changing it to a workgroup and rejoining it to the domain, that will clear up any issues if this is the problem.