Outlook Web Access Error Message "Internal Server Error" with Certain Firewalls

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Article ID: 267910 - View products that this article applies to.
This article was previously published under Q267910
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SYMPTOMS

When you use Microsoft Internet Explorer 5 or later to gain access to Microsoft Outlook Web Access (OWA), you may receive the following error message:
Internal server error
However, OWA works when you use a virtual private network (VPN) or a local intranet. Earlier version browsers also work.

CAUSE

This issue can occur because the Hypertext Transfer Protocol (HTTP) 1.1 is used when you use Internet Explorer 5 and later to gain access to OWA, and the HTTP 1.1 protocol is not supported by all firewalls. If the HTTP 1.1 protocol is not supported by the firewall, certain packets from the client are blocked and you receive the error message in the "Symptoms" section of this article.

RESOLUTION

To resolve this issue, implement a firewall solution that supports HTTP 1.1 packets.

WORKAROUND

To work around this issue, do one of the following:
  • Implement a SSL connection so that no requests are filtered.
  • Modify the firewall so that the firewall passes all HTTP packets regardless of the protocol
  • Use an earlier version browser.

MORE INFORMATION

For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base:
253615 XWEB: Using Browsers Earlier Than Internet Explorer 5 to Gain Access to Outlook Web Access
249557 XWEB: No Option to Gain Access to OWA with Internet Explorer 5 Using Code Path for Earlier Version Browsers

Properties

Article ID: 267910 - Last Review: October 25, 2007 - Revision: 3.4
APPLIES TO
  • Microsoft Exchange Server 2003 Enterprise Edition
  • Microsoft Exchange Server 2003 Standard Edition
  • Microsoft Exchange 2000 Server Standard Edition
Keywords: 
kberrmsg kbprb KB267910

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