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Request contains double escape sequence
Likely the page is was incorrectly built. In this situation, the request contains a double escape sequence that is blocked by the server (as it's a security risk).
A request is an item in the web page that tells the server special information. For example, it might specify the language to use or authentication information. There are more than twenty different types of requests.
404.11 - URL is double-escaped.
This URL is denied because it is susceptible to double-escaping attacks.
Error messages will differ depending on the web server and if replaced by the web site designers.
Frequency is relative to other Internet warnings and errors.
Solutions and Fixes
This issue can only be fixed by the web site owner.
You might notify the webmaster about the issue. Include the error number and the address (URL) where the error occurred along with any other relevant details.
Many sites use an email address in the form firstname.lastname@example.org where you replace sitename.com with the web sites address (don't include a www). Keep in mind with the amount of spam, they may use a different address and/or it might get ignored. Check the websites' contact information to get reliable contact information.
"404.11 - Request contains double escape sequence" is only supported by Microsoft IIS (Internet Information Services) web server version 7 and later.
The four hundred series of errors indicate something was sent to the remote web server incorrectly.
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so we can correct it.