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IIS 8.5 Detailed Error – 404.11

HTTP-Fehler 404.11 – Not Found

The request filtering engine is configured to reject requests that contain a double escape sequence.

Most likely causes:

  • The request contained a duplicate escape sequence and request filtering is configured on the web server to reject duplicate escape sequences.

Possible approach:

  • Check the settings for “configuration/system.webServer/security/requestFiltering@allowDoubleEscaping” in the “applicationhost.config” or “web.config” file.

Detailed error information:

Module RequestFilteringModule
notification BeginRequest
Handler StaticFile
Error code 0x00000000

Requested URL http://ffw-haselbach.de:80/wp-content/5wzb7/jhi4uf.php?34505b=laura-sophie-d%C3%BCnninger-instagram
Physical path C:websitesffwWordPresswp-content5wzb7jhi4uf.php?34505b=laura-sophie-d%C3%BCnninger-instagram
Review method Not yet determined
User login Not yet determined


Further information:

This is a security feature. Do not change this feature unless you are fully aware of the effects of the change. Before changing this value, you should run a network trace to ensure that the request is not malicious. If the server allows double escape sequences, change the setting “configuration/system.webServer/security/requestFiltering@allowDoubleEscaping”. This could be due to an incorrectly formatted URL sent to the server by a malicious user.

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