HTTP Error 404.11 - How to Fix Request Filtering Double Escape Sequence Error

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
Physical Path	C:\home\site\wwwroot\article\39151\The-Teatro-alla-Scala-and-the-%C3%93pera-de-Par%C3%ADs-order-a-%C3%B3pera-on-El -name-of-the-rose
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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2023-05-22 06:07:34
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HTTP Error 404.11 – How to Fix Request Filtering Double Escape Sequence Error