Exchange 2010 OWA error for random users

Posted on 2012-09-02
Medium Priority
Last Modified: 2012-09-08
Hi there,

Admin users with Full Access permissions over staff mailboxes open additional mailboxes within OWA and receive the following error when clicking links such as Mailbox Name (to get to Options), New E-mail, etc:

Your request couldn't be completed.

This may have occurred for security reasons or because your session timed out.

Environment consists of 5x Server 2008 Servers running Exchange 2010 v14.1 (Build 218.15) in a DAG configuration (2x HUB/CAS, 2x Mailbox, 1x DR).

Admin guys access additional mailboxes via OWA to set Out of Office for staff members.
As I said it is only happening for a few client mailboxes.

Any help would be much appreciated.

Question by:wilsonkjit
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Author Comment

ID: 38360047
Note: Most on the net refer to the following steps for resolution:

To solve the problem, you need to modify the Outlook Web App Web.config file on the Client Access server. The default location is \Program Files\Microsoft\Exchange Server\\ClientAccess\Owa as follows:
1.       Make a backup for web.config file
2.       Using notepad open the original file and find the line that contains httpCookies   httpOnlyCookies="false" requireSSL="true" domain=""
3.       Change the requireSSL option to false and save the file
4.       From command line run iisreset /noforce

web.config files for OWA in our environment have no reference to httpCookies or similar. We access OWA internally via https (redirects if accessed via http) and we have a valid certificate which matches the URL.


Expert Comment

ID: 38360109
Well how are the Admins accessing OWA for the other users. Are they logging into their own OWA and then trying to open other user's mailbox or are they typing the OWAURL followed by that user's email address...

Which IE is being used here
What of the below two options are they selecting when they log into OWA
 - This is a public or shared computer
 - This is a private computer

Are the Admins connecting through any VPN?


Author Comment

ID: 38360237
No VPN's, all local within the network. Majority use IE8 or higher and they have the same issue with Firefox, Chrome, etc. Default is left when logging in (public) but the same errors occur if the private computer option is selected.

Admins access other users mailbox by firstly logging into OWA as themselves, then opening another Mailbox by clicking on the drop-down menu over their Mailbox name.

The users they have issues with also experience the same problem when logged in as themselves. It will continually prompt with the above mentioned error pretty much anywhere they click within OWA.

Hope this info help and thanks for your response.
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Expert Comment

ID: 38360432
Kindly check if the below article helps. There is a registry setting that needs to be setup if not correctly set


Author Comment

ID: 38360442
Thank you. I will run through it in the morning and let you know ASAP.

Accepted Solution

wilsonkjit earned 0 total points
ID: 38362125
Changes have been implemented but the problem still exists. Both changes for Public and Private were made for testing purposes. A call with Microsoft may be logged as this point.

Author Closing Comment

ID: 38379021
Question not resolved within forum.

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