Unable to create mailbox or DL using sbs console or EMC on SBS 2011

Unable to create mailbox using sbs console or EMC
Getting error-
Active Directory operation failed on RSI.RecoverySystemsinc.local. This error could have been caused by user input or by the Active Directory server being unavailable. Please retry at a later time. Additional information: Additional information: The directory service encountered an unknown failure.
Active directory response: 000020EF: SvcErr: DSID-020F0323, problem 5012 (DIR_ERROR), data -1019

Its a single DC and exchange

I have Run DCDIAG /test:dns test which passed successfully with no errors

Checked the Domain Controller and Global catalog settings for mailbox server under server configuration.DC and GC are configured properly

Please help as this is hampering production
FixKar ServicesAsked:
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R--RCommented:
Check all the exchange services are running.
Check if there are any critical event in application logs in exchange.
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Simon Butler (Sembee)ConsultantCommented:
That looks pretty fatal.
The last time I saw that I ended up rebuilding the domain.

However do go through this article:
http://support.microsoft.com/kb/258062 

Do only step 1 to 12 skipping steps 7 and 8. Reboot, if the problem continues try step 15 but ONLY after taking a backup.

The other option is to call Microsoft support and get them involved. It is an AD issue, rather than Exchange and those are complicated to setup.

Simon.
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FixKar ServicesAuthor Commented:
Thank You for your reply.This artcile applies to Windows 2003. We are running SBS 2011.I am able to create AD account using ADUC.Its just the mailbox and DL creation having issues
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Simon Butler (Sembee)ConsultantCommented:
I am aware the article applies to Windows 2003, however the techniques involved are the same, because AD hasn't changed. It is an AD issue, and it is a very nasty one - you should prepare for the worst.

Simon.
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