Microsoft: OWA Redirection and SSL Offloading Fail After Installing an Exchange Server Service Pack

After you install a service pack on a server that is running Microsoft Exchange Server 2010 or Exchange Server 2007, you may experience one or more of the following issues:

• Outlook Web App or Outlook Web Access (OWA) redirection from the HTTP protocol to the HTTPS protocol fails.
• Secure Sockets Layer (SSL) offloading fails.
• An error message that resembles the following is displayed when a user tries to connect to OWA:

403 – Forbidden: Access is denied.You do not have Permission to View this directory or page using the credentials that you supplied.

• An entry that resembles the following is recorded in the IIS log:

2013-03-28 18:44:52 192.168.66.13 GET /owa/ - 80 - 192.168.66.25 Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+6.1;+WOW64;+Trident/4.0;+SLCC2;+.NET+CLR+2.0.50727;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729;+Media+Center+PC+6.0;+InfoPath.2) 403 4 5 343

To resolve this issue, follow these steps:
1. Start IIS 7 Manager.
2. Select the default website, and then make sure that you are in Features View.
3. Double-click SSL Settings.
4. Click to clear the Require SSL check box.
5. Run the IISRESET command.
6. Repeat steps 1 through 5 for all virtual websites under the default website.


Reference:
OWA redirection and SSL offloading fail after you install an Exchange Server service pack
http://support2.microsoft.com/kb/2839692