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The request filtering module is configured to deny a request that contains a double escape sequence.

HTTP Error 404.11 - Not Found
The request filtering module is configured to deny a request that contains a double escape sequence.

The request contained a double escape sequence and request filtering is configured on the Web server to deny double escape sequences.

Details of the issue is available at:
http://support.microsoft.com/kb/942076/

Resolution summary: Would suggest to read the complete article but just for quick reference I am typing the resolution here.

%windir%\system32\inetsrv\appcmd set config "Default Web Site" -section:system.webServer/security/requestfiltering - allowDoubleEscaping="true"

Or change manually by opening the following file
%windir%\System32\inetsrv\config\applicationHost.config file in notepade. (remember to open notepade with administrator privilege.

and change following value.
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Comments

  1. Anonymous11:26 AM, September 09, 2008

    Hi, thanks for the help in figuring this out. Thought you should know that in my browser (Firefox) the last part of your comment doesn't show up. I see it in the source as
    requestFiltering allowDoubleEscaping="true"

    with angle brackets around it. I didn't include above in case it didn't show in the comments either. Just FYI.

    ReplyDelete
  2. Vinod Sharma2:34 AM, September 10, 2008

    Thank for letting me know about this issue. I updated and fixed the issue.

    Thanks again.

    ReplyDelete

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