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Exchange disconnects periodically

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Hi,

We have a Windows 2003 SBS server that is causing me some problems, what happens is the clients get disconnect messages inside their Outlook email clients. This happens several times a day and I have tracked it down to a series of events which lead up to it but I cannot find the cure.

The errors from the event viewer are below:

Event Type: Information
Event Source: IISCTLS
Event Category: None
Event ID: 6
Date:  07/11/2012
Time:  08:44:24
User:  N/A
Computer: PCSSERVER01
Description:
IIS Reset encountered an error while stopping services, which was requested by NT AUTHORITY\SYSTEM.  The logged data is the status code.  Since the force option is on, IIS Reset will now terminate the services' processes.  This may cause SCM to report errors about the services exiting.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 25 04 07 80               %..€   

Event Type: Warning
Event Source: WinRM
Event Category: None
Event ID: 10149
Date:  07/11/2012
Time:  08:44:24
User:  N/A
Computer: PCSSERVER01
Description:
The WinRM service is not listening for WS-Management requests.

 User Action
 If you did not intentionally stop the service, use the following command to see the WinRM configuration:

 winrm enumerate winrm/config/listener

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

We then get some informational alerts:

The Simple Mail Transfer Protocol (SMTP) service was successfully sent a stop control.

The Microsoft Exchange Routing Engine service was successfully sent a stop control.

The Microsoft Exchange IMAP4 service was successfully sent a stop control.

The Windows Remote Management (WS-Management) service was successfully sent a stop control.

The Windows Remote Management (WS-Management) service entered the stopped state.

The Microsoft Exchange IMAP4 service entered the stopped state.

The Microsoft Exchange Routing Engine service entered the stopped state.

Then we get the following errors:

Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7034
Date:  07/11/2012
Time:  08:44:29
User:  N/A
Computer: PCSSERVER01
Description:
The World Wide Web Publishing Service service terminated unexpectedly.  It has done this 168 time(s).

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7034
Date:  07/11/2012
Time:  08:44:29
User:  N/A
Computer: PCSSERVER01
Description:
The IIS Admin Service service terminated unexpectedly.  It has done this 168 time(s).

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7034
Date:  07/11/2012
Time:  08:44:29
User:  N/A
Computer: PCSSERVER01
Description:
The Simple Mail Transfer Protocol (SMTP) service terminated unexpectedly.  It has done this 166 time(s).

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

We then start getting the following errors in the system log:

Event Type: Error
Event Source: MSExchangeSA
Event Category: Monitoring
Event ID: 1005
Date:  07/11/2012
Time:  09:35:49
User:  N/A
Computer: PCSSERVER01
Description:
Unexpected error <<0xc1050000 - Network problems are preventing connection to the Microsoft Exchange Server computer. An unexpected, unknown error has occurred. Microsoft Exchange Server Information Store ID no: 80040115-0514-000006b5>> occurred.

For more information, click http://www.microsoft.com/contentredirect.asp.

Event Type: Error
Event Source: MSExchangeSA
Event Category: MAPI Session
Event ID: 9175
Date:  07/11/2012
Time:  09:36:45
User:  N/A
Computer: PCSSERVER01
Description:
The MAPI call 'OpenMsgStore' failed with the following error:
The Microsoft Exchange Server computer is not available.  Either there are network problems or the Microsoft Exchange Server computer is down for maintenance.
The MAPI provider failed.
Microsoft Exchange Server Information Store
ID no: 8004011d-0526-00000000

For more information, click http://www.microsoft.com/contentredirect.asp.

Event Type: Error
Event Source: MSExchangeSA
Event Category: Monitoring
Event ID: 1005
Date:  07/11/2012
Time:  09:36:45
User:  N/A
Computer: PCSSERVER01
Description:
Unexpected error <<0xc1050000 - The Microsoft Exchange Server computer is not available. Either there are network problems or the Microsoft Exchange Server computer is down for maintenance. The MAPI provider failed. Microsoft Exchange Server Information Store ID no: 8004011d-0526-00000000>> occurred.

For more information, click http://www.microsoft.com/contentredirect.asp.

Event Type: Error
Event Source: MSExchangeSA
Event Category: MAPI Session
Event ID: 9175
Date:  07/11/2012
Time:  09:37:42
User:  N/A
Computer: PCSSERVER01
Description:
The MAPI call 'OpenMsgStore' failed with the following error:
The Microsoft Exchange Server computer is not available.  Either there are network problems or the Microsoft Exchange Server computer is down for maintenance.
The MAPI provider failed.
Microsoft Exchange Server Information Store
ID no: 8004011d-0526-00000000

For more information, click http://www.microsoft.com/contentredirect.asp.

This is causing a few issues for me so any help gratefully received.

Thanks,

alamb200


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