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In a Microsoft Exchange Server 2013 environment, when you restart a Database Availability Group (DAG) node that contains active database copies, the healthy copies on other DAG nodes cannot be enabled. Meanwhile, event ID 4999 for MSExchangeRepl.exe is logged in the Application event log multiple times until the restarted node comes completely online. When this issue is occurring, Windows clients may be disconnected.

The following event is recorded in the Application event log:

Log Name: Application
Source: MSExchange Common
Date: date time
Event ID: 4999
Task Category: General
Level: Error
Keywords: Classic
User: N/A
Message: Watson report about to be sent for process id: 33564, with parameters: E12IIS, c-RTL-AMD64, 15.00.1178.004, msexchangerepl, M.Exchange.Rpc, M.E.R.A.AmRpcClient.IsRunning, System.OutOfMemoryException, da11, 15.00.1178.004.


This issue occurs because of an "out of memory" issue for remote procedure calls.

Cumulative update information

For Exchange Server 2013

To resolve this issue, install Cumulative Update 15 for Exchange Server 2013 or a later cumulative update for Exchange Server 2013.


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


Learn about the terminology that Microsoft uses to describe software updates.

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