Active Directory domain. Four server 2003 domain controllers.
DNS was being handled on a Linux bos. This past weekend, changes were made to make DC#1 the primary DNS server. Zones have been AD integrated (I wasn't involved so I don't know what that entailed..)
Today I noticed when I created a new user, the email addressing was not being supplied. I checked the Exchange server under Recipient update service and found that its properties were pointing to DC#2. On a whim I changed it to point to DC#1 - the recipient policies began to work.
However, when using Group Policy, I am unable to make a change. When I select an OU, right click and select "Link an existing GPO," I get the error, ""a device attached to the system is not functioning."
What to do?