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Troubleshooting HTTP Error 404.11 – Not Found: Double Escape Sequence Rejected by Request Filtering Module

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   
Physical Path   D:\wwwroot\museenkoeln.de\ns-dokumentationszentrum\default.aspx?sfrom=2475&s=2460&id=19539&buchstabe=W&ort=Auschwitz,%20Kasernenstra%C3%9Fe
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.

View more information »

2023-11-12 02:31:40
#IIS #Detailed #Error

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