Troubleshooting HTTP Error 404.11 – Not Found: Double Escape Sequence Rejection

Error summary

HTTP Error 404.11 – Not Found

The request filtering module is configured to reject requests containing double escape sequences.

Detailed error information Module RequestFilteringModule Notification BeginRequest handler ExtensionlessUrlHandler-Integrated-4.0 Error code 0x00000000 Requested URL Physical path D:\www\forbes\public\business\%E5%95%86%E4%B8%9A\67037 Login method not yet available Determining that the logged in user has not been determined The request to the trace log directory failed C:\inetpub\logs\FailedReqLogFiles Most likely cause:

  • The request contained a double escape sequence, and request filtering configured on the web server rejects double escape sequences.

Things to try:

  • Confirm the configuration/system.webServer/security/requestFiltering@allowDoubleEscaping setting in the applicationhost.config or web.confg file.

Links and more information This is a security feature. Please do not change this feature unless you are fully aware of the scope of the change. Before changing this value, a network trace should be performed to confirm that the request is not malicious. If your server allows double escape sequences, modify the configuration/system.webServer/security/requestFiltering@allowDoubleEscaping setting. This may be caused by a malformed URL sent to the server by a malicious user.

More information”

2024-02-04 09:34:46
#IIS #detailed #error

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