Exchange Management Console Error 0x51
One of my customer was facing problem with exchange 2010. When opening Exchange Management Console, it was giving the following error:
Process w3wp.exe Exchange Active Directory Provider lost contact with domain controller . Error was 0x51 (Server Down). Server DC1.domain.com cannot be contacted.
While opening Organization configuration in EMC was also giving the following error:
After getting more details, i was told, there was a domain controller DC1 that crashed recently and all FMSO roles were seized to the DC2.
I checked DNS and exchange settings, all were OK, but this exchange 2010 server was some how still pointing to the wrong DC, DC1 in this case.
So i googled, and found the following Microsoft support article:
DC1 information was cached in the EMC file in windows profile with whom the user was logged into the Exchange Server.
C:\users<specific user>AppDataRoamingMicrosoftMMCand delete “Exchange Management Console” file.
After that i closed the EMC and opened again, and this time there was no error about the DC1.
Same customer was facing DNS Access denied error, you can check it on my another post, “DNS Access denied”