[SOLVED] Exchange 2010 – Outlook Web Access error 403 access is denied

Problem:

When you go to access your Outlook Web App website you recieve the following message:

Server Error 403 - Forbidden: Access is denied. You do not have permission to view this directory or page using the credentials that you supplied.

 MSExchange-OWA403

Solution:

In Exchange 2007 and Exchange 2010 Outlook Web Access (OWA) uses HTTP Secured (HTTPS) by default and therefore when you type the URL you must type https://server.domain.com/owa instead of http://server.domain.com/owa

You can also configure your server to automatically redirect http request to OWA web site as https requests:

  1. Log onto your Exchange server hosting the Client Access Server (CAS) role
  2. Open the IIS Management console (Start -> Administrative Tools -> Internet Information Services (IIS) Manager)
  3. Expand the ‘Default Website’ and click on ‘OWA’
  4. From the main window, click on ‘HTTP Redirect’
  5. Place a tick next to ‘Redirect requests to this destination’
  6. Enter in the full https address for your OWA install.

MSExchange-OWARedirect

Detailed instructions can also be found on Microsoft Technet: