IIS 10.0 Detailed Error – 404.11

July 28, 2020

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    StaticFile
Error Code    0x00000000
Requested URL    http://www.aberystwyth-today.co.uk:80/article.cfm?id=133528&headline=Aberystwyth%20University%20to%20investigate%20data%20breach&sectionIs=news&searchyear=2020
Physical Path    E:Domainsaberystwyth-today.co.ukwwwrootarticle.cfm?id=133528&headline=Aberystwyth%20University%20to%20investigate%20data%20breach&sectionIs=news&searchyear=2020
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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