Microsoft KB Archive/944006

= Cannot access HTTPS web site if Web Proxy Filter is bound to HTTPS protocol =

Article ID: 944006

Article Last Modified on 12/4/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2006 Enterprise Edition
 * Microsoft Internet Security and Acceleration Server 2006 Standard Edition
 * Microsoft Internet Security and Acceleration Server 2004 Enterprise Edition
 * Microsoft Internet Security and Acceleration Server 2004 Standard Edition

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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


Result
Client cannot access HTTPS web site through ISA 2006.

If you check Network Monitor trace, you will find the ISA server side responds a HTTP 400 Bad Request to the client. This usually indicates SSL is attached with the Web Proxy filter.



Cause
Web proxy filter is bound to HTTPS protocol.

To verify whether this is the problem, please follow the steps below.

1. Go to Firewall Policy, on the right pane, click Toolbox tab, expand Protocols.

2. Right click HTTPs protocol, click Properties, verify if Web Proxy Filter is checked.

3. If Web Proxy Filter is checked, that can be the cause of the problem.



Resolution
Detach web proxy filter from HTTPS protocol.

To do so, please follow the steps below:

1. Go to Firewall Policy, on the right pane, click Toolbox tab, expand Protocols.

2. Right click HTTPS protocol, click Properties, uncheck Web Proxy Filter.



MoreInformation
By default, Web Proxy Filter only attached with HTTP protocol but not HTTPS protocol. If Web Proxy Filter is attached with HTTPS protocol, it will grasp the HTTPS traffic but cannot handle it correctly.



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Keywords: kbnomt kbrapidpub KB944006

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