IIS 8.5 Detailed Error – 404.11

HTTP Error 404.11 – Not Found

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

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.

Detailed Error Information:

Module RequestFilteringModule
Notification BeginRequest
Handler aspNetCore
Error Code 0x00000000
Requested URL https://1303-1342:80/articulo/37927/Javier-Perianes-directs-four-concerts-to-the-Orquesta-Sinf%C3%B3nica-de-Castilla-y-Le%C3%B3n
Physical Path C:\home\site\wwwroot\articulo\37927\Javier-Perianes-directs-four-concerts-to-the-Orquesta-Sinf%C3%B3nica-de-Castilla-y-Le%C3%B3n
Logon Method Not yet determined
Logon User Not yet determined

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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