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Exchange 2010 is still looking for Demoted Domain Controller

When I was checking events today at one of our customers I mentioned one weird event. It was:

Event 2070

Process MSExchangeMailboxReplication.exe () (PID=1388).  Exchange Active Directory Provider lost contact with domain controller OLD_DC_NAME.  Error was 0x51 (ServerDown) (Active directory response: The LDAP server is unavailable.).  Exchange Active Directory Provider will attempt to reconnect with this domain controller when it is reachable. 

I’ve checked SRV and A records in DNS. I’ve checked Meta Data in Active Directory Domain for OLD_DC_NAME records. I also checked Active Directory Domain for any records for OLD_DC_NAME using ADSI Edit utility. I found nothing so I started to thought it’s kinda hard-coded into Exchange. But I didn’t want to believe it.

Then I started to look for some path or any kind of help on Microsoft website and I found one interesting article http://support.microsoft.com/kb/2019500. It says to delete cached MMC console settings for EMC and all weird events dissapeared.

What I well designed and prepared MMC caching mechanism 🙂

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