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   ExtensionlessUrlHandler-ISAPI-4.0_32bit
Error Code   0x00000000
Requested URL   http://www.felbridge-pc.org.uk:80/shared/f=eb490167%2Dcce5%2D4f7d%2Db89d%2D1da1e53a1a09%2Epdf&o=FPC%2DPublic%2DRights%2DNotification%2D2022%2Epdf
Physical Path   C:\DATA\websites\www.hugofox.com\shared\f=eb490167%2Dcce5%2D4f7d%2Db89d%2D1da1e53a1a09%2Epdf&o=FPC%2DPublic%2DRights%2DNotification%2D2022%2Epdf
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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