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   PageHandlerFactory-Integrated-4.0
Error Code   0x00000000
Requested URL   http://www.hnue.edu.vn:80/Tint%E1%BB%A9cS%E1%BB%B1ki%E1%BB%87n/S%E1%BB%B1ki%E1%BB%87n/tabid/261/Category/37/News/8338/ThongbaotochucthivacapchungchitiengAnhbac2345theokhungnanglucngoaingu6bacdungchoVietNamtuongduongcaccapdoA2B1B2C1theokhungCEFRthang82020.aspx
Physical Path   D:\dhsphn.edu.vn\Tint%E1%BB%A9cS%E1%BB%B1ki%E1%BB%87n\S%E1%BB%B1ki%E1%BB%87n\tabid\261\Category\37\News\8338\ThongbaotochucthivacapchungchitiengAnhbac2345theokhungnanglucngoaingu6bacdungchoVietNamtuongduongcaccapdoA2B1B2C1theokhungCEFRthang82020.aspx
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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