referer or referrer
The referrer, or HTTP referrer, identifies, from the point of view of a internet webpage or resource, the address of the webpage (commonly the URL, the more generic URI or the i18n updated IRI) of the resource which links to it. By checking the referrer, the new page can see where the request came from. referrer logging is used to allow websites and web servers to identify where people are visiting them from, for promotional or security purposes. Since the referrer can easily be spoofed (faked), however, it is of limited use in this regard except on a casual basis.
If you use Firefox you can block sending referrer information by following these steps:
In my case, this was already done previously so I changed the value back to 2 and downloaded a Firefox extension called refcontrol what gets sent as the HTTP referer on a per-site basis.
1. In the address bar of your Firefox browser type: about:config and hit Enter.
2. In the Filter input field type: network.http.sendreferrerHeader.
3. Double click on the preference name.
4. Change the value from 2 to 0 and hit OK.
It wasn't until I tried the url in IE that I found out it was Firefox that had the issue and not my firewall.