Article ID: 948830 - View products that this article applies to.
The MSExchangeSyncAppPool application pool crashes on a server that hosts a Microsoft Exchange Server 2007 Client Access Server role. If the default rapid-fail protection setting is used, the application is disabled after the crash occurs 5 times within five minutes. Therefore, the Exchange ActiveSync functionality becomes unavailable until the World Wide Web Publishing Service restarts.
When this problem occurs, the following events are logged in the System log:
Event ID 1011
Event Type: Warning
Event Type: Warning
Event Type: Error
To resolve this problem, install Update Rollup 2 for Microsoft Exchange Server 2007 Service Pack 1. For more information about Update Rollup 2 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic:
Description of Update Rollup 2 for Exchange Server 2007 Service Pack 1For more information about how to obtain the latest Exchange service pack or update rollup, see the following Exchange Help topic:
How to Obtain the Latest Service Pack or Update Rollup for Exchange 2007
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
To verify the rapid-fail protection setting of the MSExchangeSyncAppPool application pool, follow these steps:
http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/c9b5db6f-874e-4ec9-93ed-1733367c117b.mspxThis problem generates a stack output that resembles the following.
Exception type: System.IO.IOException Exception message: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. Exception level: 0 Exception stack trace: at System.Net.ConnectStream.EndRead(IAsyncResult asyncResult) at Microsoft.Exchange.AirSync.ProxyHandler.BackEndReadContent(IAsyncResult asynchronousResult) Inner exception follows... Exception type: System.Net.Sockets.SocketException Exception message: An existing connection was forcibly closed by the remote host Exception level: 1 Exception stack trace: at System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult) at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)