Hi -
1. Is DNS running on the Server1, configured as the domain controller? If so, does Server1's DNS setting in TCP/IP point to itself or to other DNS servers in your forest? It could be that the SRV records did not get registered properly. Once you enter the correct DNS entries in TCP/IP settings at the DC, populate the zone with SRV records by stopping and starting the Netlogon service.
2. Secondly, if Server1 is the first DC in the forest, it will automatically also be the global catalog server. However, if Server1 was not the first DC in the forest, you must configure it as a GC, providing that's what you want. To verify this from your DC:
a. Click Start, point to Programs, click Administrative Tools, and then click Active Directory Sites and Services.
b. Double-click Sites to expand it, expand Servers, and then select your domain controller.
c. Double-click the domain controller to expand the server contents.
d. Below the server, an NTDS Settings object is displayed. Right-click the object, and then click Properties.
e. On the General tab, you can observe a global catalog check box, which should be selected, by default.
3. Something else I would check is to confirm you can ping DNS from your Unity server, as well as the DC/GC.
Here is a good Microsoft link that discusses the netdiag command which can be used to see what SRV records have been registered - http://support.microsoft.com/?id=241505
And this one too, not that you are seeing the same event records, but provides additional info on troubleshooting - http://technet2.microsoft.com/WindowsServer/en/library/f4c20360-d997-4278-a9bc-32b845d561221033.mspx?mfr=true
Ginger
