We are having an issue with 2 - Windows 2008 Domain Controllers Replicating. I just added a second writable Domain controller and during the promotion I ran into the following warning "A delegation for the DNS server cannot be created because the authoritative parent zone cannot be found or it does not run Windows DNS server...You can manually create a delegation to this DNS server in the parent zone to ensure reliable name resolution from outside the domain. Do you wish to continue?" I double checked DNS and made sure everything looked good. I ran DCPROMO again and still got the error but continued. The second DC is a GC as well. When it was complete I opened up DNS on the second DC and took a look at everything. all the records for the forward and reverse zones look like they created. The zone is AD integrated. I then ran a DCDIAG on both DC's and noticed some errors. I want to know how to clean these errors up and want to make sure the second DC is properly replicating. Also I checked Sites and Services and noticed the second DC did not have a connection to DC1 but DC1 had a connection to DC2. Not sure if I needed to do it but I created a manual connection from DC2 to DC1. If I run repadmin /sync all on DC1 or DC2 they both finish successfully. I will include DCDIAGS. Also there are RODC's but they seem to be working properly. Thanks for any help!