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IIS 7.5 Detailed Error – 404.11

Error Summary

HTTP Error 404.11 – Not Found

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

Detailed Error Information
Module RequestFilteringModule
Notification BeginRequest
Handler StaticFile
Error Code 0x00000000
Requested URL http://www.dci.com.br:80/internacional/maduro-promete-referendo-para-nova-constituicao%C2%A0da-venezuela;-numero-de-mortos-chega-a-62-id629329.html
Physical Path e:homedci4Webinternacionalmaduro-promete-referendo-para-nova-constituicao%C2%A0da-venezuela;-numero-de-mortos-chega-a-62-id629329.html
Logon Method Not yet determined
Logon User Not yet determined
Failed Request Tracing Log Directory C:inetpublogsFailedReqLogFiles
Most likely causes:
  • The request contained a double escape sequence and request filtering is configured on the Web server to deny double escape sequences.
Things you can try:
  • Verify the configuration/system.webServer/security/requestFiltering@allowDoubleEscaping setting in the applicationhost.config or web.confg file.
Links and More Information

This is a security feature. Do not change this feature unless the scope of the change is fully understood. You should take a network trace before changing this value to confirm that the request is not malicious. If double escape sequences are allowed by the server, modify the configuration/system.webServer/security/requestFiltering@allowDoubleEscaping setting. This could be caused by a malformed URL sent to the server by a malicious user.

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