At a customer site doing some due diligence on AD health. DCDiag from the first Exchange 2010 CAS server against the FSMO holder failed on the DFRSEvent and KCCEvent checks with an event ID of 0x6BA. Running the same test on the FSMO holder (we need to extend the schema folks!) failed with 0x6BA also.
Once we got the first issue reduced, then another popped up on both the FSMO holder and the DCDiag from the Exchange CAS server: 0x8000043B
Doing a little googling revealed this blog entry that got me started on fixing the issue. However, this blog entry clearly stated that the “Remote Service Management (RPC)” was the culprit.
Enabling this rule in the DC’s firewall did not help me; so I started with all the rest that looked like they might be what I was looking for. Not the most scientific method, but my reasoning was that it was better than turning the FW off entirely. Also, all other data I could find for this issue all pointed back to the one blog – that guy should be charging for plagiarism! For my situation, we had to enable this other rule also: “Remote Administration (RPC)” as shown.
At this point, DCDiag /s:fsmohost completed so quickly you would have thought the entire thing errored out. Instead, what it did was pitch the KCCEvent event ID: 0x8000043B. Not good, I still need the FSMO holder to behave so I can extend the schema (amongst other tasks…). After wading through more googles, the fix to this second layer of error was:
wala! Nice clean dcdiag runs from both the FSMO holder and the exchange servers.