Hello,
I am having a weird DNS issue after adding a new 2012 R2 Domain Controller (with DNS) to our existing environment. We had three 2008 R2 Domain Controllers with DNS prior to adding the 2012 R2 DC. I am decommissioning one of the old DC's so I started pointing the other DCs DNS settings to the new DC on Friday.
On Monday, users were not able to resolve certain network resources (file server, SQL server, SharePoint, so far). After looking at the DNS records for all four DNS servers, I noticed that the newest DC was missing the A records of the resources end users could not resolve.
The missing DNS records showed up on the previous 3 DNS servers, but were missing from the newest one. All other records appear to be there, minus the handful of missing ones I have discovered thus far. I added static records for the missing ones on the new DNS server and the change updated across all DNS servers.
But the question is, why did this happen? I cannot seem to find an explanation anywhere for a similar scenario. Is there something special I need to do on 2012 R2 Domain Controllers/DNS servers? I thought records were supposed to be identical across all DNS servers?
Thanks in advance for any help you may provide