HTTP_REFERER

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what is stopping HTTP_REFERER? Is it windows firewall?
What are the dangers of enabling HTTP_REFERER ?

My users seem to be able to vast search sites but one particular domain,
promocan.com

For example searching at http://creativeconcepts.promocan.com/ will result
in
Page Cannot Be Displayed

You have encountered this page for one of the following reasons:

. The page you are currently looking for cannot be found or you
have entered an invalid URL.

. Cookies are required for certain functionalities on this
website and you do not have them enabled.

. You are using a Firewall / Proxy / Anonymizer / Ad blocker
that strips vital http headers and doesn't allow this page to load properly.
Make sure that you are not blocking the HTTP_REFERER
field. On various firewalls, especially from Symantec/Norton, this feature
appears as the privacy settings. This has nothing to do with privacy and it
is a standard HTTP protocol field.
Please note that you don't have to disable the firewall,
just enable the referer field.




despite, cookies enabled,


.