Hi,
I have the following AD infrastructure
Single domain / forest (2003 Native with mix 2003R2 and 2008R2 DCs)
around 75+ DC around the globe.
Recently I have started to see dcpromo failures with Event IDs 1645, 1168, and 1125 logged on DC candidate Server.
DC reported in these events has SPNs registered and I can query them
Strange thing is that DCPRMO only fails if I pick an existing 2008 R2 DCs to replicate AD from.
If I pick a 2003 DC as dcpromo AD replication source, dcpromo succeeds.
Has anyone seen this problem or can put finger on the issue.
I have been through most of the posts around event ID 1645 and have made sure IP/DNS and computer account are ok.
There are no replication issues with any DC in the entire domain.
My guess is that its the SPN Querry during dcpromo failing on 2008 R2 DCs, as using 2003 all process goes smoothly (IP / DNS / SPN all work ok) and new DC as healthy with any errors. as I am also gradually emoting 2003 DCs, want this issue resolved asap.