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When a witness server of a Microsoft Exchange database availability group (DAG) is under a heavy workload, the Microsoft Exchange Replication service crashes on Exchange Server 2010 DAG members. Additionally, following error messages are logged on Exchange Server 2010 DAG members:

Log Name:      Application
Source:        MSExchange Common
Date:          Date
Event ID:      4999
Task Category: General
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      Computer
Watson report about to be sent for process id: Process ID, with parameters: E12, Build Type, Version, msexchangerepl, M.E.Cluster.Replay, M.E.C.A.AmHelper.GetBootTimeWithWmi, S.Management.ManagementException, XXXX, Version.
ErrorReportingEnabled: True

Log Name: Application
Source: MSExchangeRepl
Date: Date
Event ID: 2060
Task Category: Service
Level: Error
Keywords: Classic
User: N/A
Computer: Computer
The Microsoft Exchange Replication service encountered a transient error while attempting to start a replication instance for mailbox database\mailbox server. The copy will be set to failed. Error: The NetworkManager has not yet been initialized. Check the event logs to determine the cause.

Note If you run the following cmdlet against the witness server from the DAG members, the WMI query fails:

(Get-WmiObject -Class Win32_OperatingSystem -ComputerName Witnessservername).LastBootUpTime


This issue occurs because an OutOfMemoryException exception occurs when DAG members try to obtain the start time of the witness server by Windows Management Instrumentation (WMI). This exception causes the Microsoft Exchange Replication service to crash on the DAG members.


To resolve this issue, install the following update rollup:

2645995 Description of Update Rollup 1 for Exchange Server 2010 Service Pack 2


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 database availability group, visit the following Microsoft website:

General information about database availability groupFor more information about the Get-WmiObject cmdlet, visit the following Microsoft website:

General information about the Get-WmiObject cmdlet

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