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   ExtensionlessUrl-Integrated-4.0
Error Code   0x00000000
Requested URL   http://alumni.hnue.edu.vn:80/Gi%E1%BB%9Bi-thi%E1%BB%87u/Ban-li%C3%AAn-l%E1%BA%A1c-C%E1%BB%B1u-ng%C6%B0%E1%BB%9Di-h%E1%BB%8Dc-c%C3%A1c-khoa-tr%C6%B0%E1%BB%9Dng-th%C3%A0nh-vi%C3%AAn
Physical Path   D:\alumni1.hnue.edu.vn\Gi%E1%BB%9Bi-thi%E1%BB%87u\Ban-li%C3%AAn-l%E1%BA%A1c-C%E1%BB%B1u-ng%C6%B0%E1%BB%9Di-h%E1%BB%8Dc-c%C3%A1c-khoa-tr%C6%B0%E1%BB%9Dng-th%C3%A0nh-vi%C3%AAn
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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