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.osservatoriodelpaesaggio.org:80/images/2008/Camminata%20Boschi%20di%20Valmanera%20(20%2009%2008)/Passeggiata%20micologica%20-%20Boschi%20di%20Valmanera%20(Paola%20Grassi)/slides/Passeggiata micologica (Paola Grassi)_123.html
Physical Path   D:\inetpub\webs\osservatoriodelpaesaggioorg\images\2008\Camminata%20Boschi%20di%20Valmanera%20(20%2009%2008)\Passeggiata%20micologica%20-%20Boschi%20di%20Valmanera%20(Paola%20Grassi)\slides\Passeggiata micologica (Paola Grassi)_123.html
Logon Method   Not yet determined
Logon User   Not yet determined
Request Tracing Directory   D:\LogFiles\FailedReqLogFiles

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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