fter upgrading Exchange Server 2010 to Service Pack 3 you can access Outlook Web App without SSL as usual, but there’s the following problem after signing in successfully to OWA by http://servername/
When you click on Options, or ‘new mail’ or many other places, an error message appear: “Your request couldn’t be completed. This may have occurred for security reasons or because your session timed out”.
If you access OWA by https://servername/, everything is ok, Unchecking “Require SSL” settings in IIS doesn’t help.
The solution is editing the web.config file and change the requireSSL=”true” to “false” , see the steps below :
--> Please see the rest on the blog : http://www.problutions.com/?p=704