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IIS 7.0 Detailed Error – 404.11

Error Summary

HTTP Error 404.11 – Not Found

The request filtering module is configured to deny a request that contains a double escape sequence.

Detailed Error Information
Module RequestFilteringModule
Notification BeginRequest
Handler StaticFile
Error Code 0x00000000

Requested URL http://careers.svu.org:80/jobs/?keywords=employer:%22The%20Hospitals%20of%20Providence%20Sierra%20Campus%22
Physical Path C:devwwwrootjobs?keywords=employer:%22The%20Hospitals%20of%20Providence%20Sierra%20Campus%22
Logon Method Not yet determined
Logon User Not yet determined


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.

Links and 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.

View more information »


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