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Error message when Exchange Server 2003 tries to retrieve compressed content in an ISA 2004 organization: "The request is not supported"
Article ID: 920856 - View products that this article applies to.
When Microsoft Exchange Server 2003 tries to retrieve compressed content in a Microsoft Internet Security and Acceleration (ISA) Server 2004 organization, you may receive the following error message:
Error Code: 500 Internal Server Error. The request is not supported.
This issue may occur when either of the following conditions is true:
When a mail server publishing rule is used, the rule enables the ISA Server computer to forward "Accept-Encoding" headers from clients to a Web server. If a client sends an "Accept-Encoding" header that states that the client will accept compressed content, the published Web server may send a compressed response. This is indicated by the response's "Content-Encoding" header. This header is accepted by the ISA Server computer and then forwarded to the client.
Note The ISA Server computer does not cache the compressed content.
To resolve this issue, delete the current Web server publishing rule for the site. Then, run the Publish a Mail Server wizard by using the Outlook Web Access option.
To delete a Web server publishing rule in ISA Server 2004, follow these steps:
For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/837865/ )You receive a "The request was rejected by the HTTP Security filter" error message when you try to open a message from an Exchange Server that is published in ISA Server 2004
(http://support.microsoft.com/kb/896367/ )Windows Server 2003 Service Pack 1 application compatibility
Article ID: 920856 - Last Review: December 4, 2007 - Revision: 1.3