HTTP 404.11 Error: Request Filtering Blocks Double Escape Sequence

Most likely causes:

• The request contained a double-escaping sequence, and request filtering is configured on the web server to deny double-escaping sequences.

Things you can try:

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

Additional error information:

Additional Information :

This is a security feature. Only modify it if the scope of the modification is fully understood. You should obtain a network trace before changing this value to confirm that the request is not malicious. If double escaping sequences are allowed by the server, modify the configuration/system.webServer/security/requestFiltering@allowDoubleEscaping parameter. This may be due to an incorrect URL sent to the server by an malicious user.

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