Admin sessions are exhausted as a result of delegate access in an Exchange Server 2010 environment

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Article ID: 2726897 - View products that this article applies to.
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Symptoms

Consider the following scenario:
  • You install Microsoft Exchange Server 2010.
  • You delegate some management roles.
  • The delegates have Full Access permissions to some mailboxes.
  • The delegates perform actions on the mailboxes at the same time.
  • The actions generate copy-on-write delegate access requests and create many admin sessions. For example, more than 10,000 admin sessions are created.
  • You try to run an Exchange Server cmdlet. For example, you try to run the Test-MapiConnectivity cmdlet to verify server functionality in a mailbox.
In this scenario, the cmdlet may fail. For example, one or more of the following events are logged in the Application log when you try to run the Test-MapiConnectivity cmdlet:

Time: Time
ID: 14035
Level: Error
Source: MSExchange MailTips
Machine: Computer
Message: Process Microsoft.Exchange.InfoWorker.Common.Delayed`1[System.String]: MailTips query failed for mailbox Mailbox. Latency: total:7. The returned exception is: Microsoft.Exchange.Data.Storage.TooManyObjectsOpenedException: Cannot open mailbox /o=Organization/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Configuration/cn=Servers/cn=Computer/cn=Microsoft System Attendant. ---> Microsoft.Mapi.MapiExceptionSessionLimit: MapiExceptionSessionLimit: Unable to open message store. (hr=0x80040112, ec=1246)



Time: Time
ID: 1006
Level: Warning
Source: MSExchange Mailbox Replication
Machine: Computer
Message: The Microsoft Exchange Mailbox Replication service was unable to process jobs in a mailbox database.
Database: Database
Error: MapiExceptionSessionLimit: Unable to make connection to the server. (hr=0x80040112, ec=1246)


Cause

This problem occurs because the maximum number of admin sessions on the Exchange Server 2010 mailbox server is 10,000. Therefore, no more admin session can be created when 10,000 copy-on-write delegate access requests to the mailboxes are issued.

Resolution

To resolve this issue, download and install Update Rollup 4 for Exchange Server 2010 Service Pack 2. For information about how to download and install Update Rollup 4 for Exchange Server 2010 Service Pack 2, visit the following Microsoft website:

http://www.microsoft.com/en-us/download/details.aspx?id=30478


Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More information

For more information about the Test-MapiConnectivity cmdlet, go to the following Microsoft website:
General information about the Test-MapiConnectivity cmdlet

References

For more information about Update Rollup 4 for Exchange Server 2010 Service Pack 2, click the following article number to view the article in the Microsoft Knowledge Base:

2706690 Description of Update Rollup 4 for Exchange Server 2010 Service Pack 2


Properties

Article ID: 2726897 - Last Review: September 4, 2013 - Revision: 4.0
Applies to
  • Microsoft Exchange Server 2010 Standard
  • Microsoft Exchange Server 2010 Enterprise
Keywords: 
kbqfe kbsurveynew kbexpertiseinter kbtshoot kbprb KB2726897

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