Problems with the MS Exchange connection

Hello SDN members,
I have a problem with the connection between our EP 6 SR1 and our Exchange Server 2003.
Sometimes the connection works, I get the calendar data from the Exchange Server. But mostly I get the error message:
An exception occurred while reading or writing from/to the IIS server
and the error message in the log file on the IIS is:
...../Calendar.asp |87|800a01a8|Object_required .....
If I test the connection with the SAP test program (sapexchangetest), I get no error message.
What can be the problem?
regards
Jochen

Hi,
Unfortunately looking in on this with the limited information I can only venture a few guesses as to where your problem may reside - inspecting yoru NWA logs and performing a trace should provide you with more detail though.
Here is where I would look:
1.) Check the portal proxy config. It may well be that you have also cache enabled access to your exchange environment and any dynamic changes are causing your problem.
2.) Your IIS settings for the calander app need to be reviewed. You may need to re-register the dll and refresh the app or restart IIS. This is typical of dynamic changes in you IIS space. You may need to establish change windows to prevent issues from occurrng.
3.) Your security configuration on IIS need to be reviewed. If the aplication session lifetime is different to that of your portal session lifetime and you are invalidated by IIS you will experience issues.
Hope this helps.
Doug.
Check the IIS logs or NWA logs for additional info to isolate the root cause.

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