23 March 2008

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:

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.



  1. 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.

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

    Thanks again.


Note: Only a member of this blog may post a comment.