Microsoft KB Archive/946957

= &quot;HTTP Error 403.4 Forbidden&quot; Error Message When Users With Mailboxes on Exchange Server 2003 Login to OWA Using the Exchange 2007 CAS Server =

Article ID: 946957

Article Last Modified on 12/31/2007

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APPLIES TO


 * Microsoft Exchange Server 2007 Standard Edition
 * Microsoft Exchange Server 2007 Enterprise Edition
 * Microsoft Exchange Server 2007 Service Pack 1

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Source: Microsoft Support



RAPID PUBLISHING
RAPID PUBLISHING ARTICLES PROVIDE INFORMATION DIRECTLY FROM WITHIN THE MICROSOFT SUPPORT ORGANIZATION. THE INFORMATION CONTAINED HEREIN IS CREATED IN RESPONSE TO EMERGING OR UNIQUE TOPICS, OR IS INTENDED SUPPLEMENT OTHER KNOWLEDGE BASE INFORMATION.



Action
Consider the following scenario:

1. You have an Exchange Server 2003 and Exchange Server 2007 mixed Organization and your mailbox is located in Exchange Server 2003.

2. You enter URL  to access your mailbox through Exchange 2007 CAS Server by using Outlook Web Access.



Result
In this scenario, after putting in the credentials, you get an error page with the message:

The page must be viewed over a secure channel.

HTTP Error 403.4 - Forbidden: SSL is required to view this resource.



Cause
The Exchange virtual directory in the IIS of Exchange Server 2003 had the option &quot;Require SSL&quot; checked, which means you are forcing communication through port 443 only.



Resolution
To resolve this issue, you must uncheck the option &quot;Require SSL&quot; on the Exchange and Public virtual directory in the IIS of Exchange Server 2003. Unchecking this option, allows Exchange 2007 CAS Server to communicate with Exchange Server 2003 on port 80, instead of forcing it to use port 443.



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Keywords: kbnomt kbrapidpub KB946957

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