Just this week we have started to get the following error when trying to open e-mails on OWA. The server oepration timed out. Please try again later Here is a screenshot: http://i52.tinypic.com/2mc8saa.jpg In addition this, OWA will occassionaly freeze when checking the spelling. So far we have about 5 or 6 reported cases of this but I would like to try and get it fixed before it becomes more of a problem. I have increased the diagnostic logging properities of MSExchange OWA\Core and MSExchange OWA\Configuration to Expert level but there is nothing ovbious appearing in the event logs. We are running Exchange 2010 SP1 UR2 on Windows Server 2008 R2 Enterprise. The clients are all Windows XP SP3 using IE 8 as the browser. Does anybody have any ideas what might be causing this? Cheers Adam.

Did you take a look through your IIS logs to see if you can locate the HTTP request and perhaps an HTTP status code that generated this error? If you can get an HTTP status code, then I would set up a IIS trace log to generate a debug log when this occurs again.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

The log file I am looking at has a mixture of status codes (all captured today) including: 200, 206, 301, 302, 304, 400, 401, 401.1, 401.2, 403.4, 404, 440, 500, 500.19 Which would be generated during a server timeout? How do I setup an IIS trace log? Cheers Adam.

Hi adamf83, Do you have a CAS Array? Please check whether the issue will be occured both in Internal or External connection. Please run the Exbpa in the Toolbox. If possible, please reset the OWA VD using EMC: Server Configuration->Client Access->Actions->Reset Virtual Directory. Please also temp disable the Anti-Virus software to test. Frank Wang TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi adamf83, Any updates?Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Frank, No CAS array It appears to effect the external connection more. Exbpa didn't highlight any problems I have reset the OWA VD and the issue seems to have improved slightly but users are still getting the error messages We have no on-access anti-virus scanning on any servers. Just scheduled scans out of hours. Cheers Adam.

Frank (or anybody else), Just wondering if you have any more idea what might be causing the problem. The error message below has appeared a couple of times in the application event log on the CAS server: Watson report about to be sent for process id: 8716, with parameters: E12, c-RTL-AMD64, 14.01.0218.015, OWA, unknown, unknown, System.InvalidOperationException, 0, unknown. ErrorReportingEnabled: True Does that shed any light? Cheers Adam.

This is also happening when users try and spell check e-mails. See the screenshot in the link below. http://i55.tinypic.com/28hopl4.jpg Does anybody have any ideas?

Still having problems with this... A couple of new fixes I've tried. I've uninstalled our Anti-Virus product from the CAS server - no change Applied Ex2010 SP1 RU3 to both servers - no change I created a new authorative dns zone (for our external OWA URL), added an A record with no name and pointed it at both of our CAS servers (seperatly) - this has made no difference. Does anybody have any suggestions? I'm now really stuck with this... Cheers Adam.

And now this error message has started to appear on clients (see screenshot) http://i51.tinypic.com/ddgab4.jpg Cheers Adam.

To solve this issue we had to get staff using our internal OWA url. Since doing this there has been no more occurances of the error.