URL redirect gives error in browser "not redirecting properl

Im trying to set up web proxy to redirect URL from specific source address to deny then redirect to url, but no matter what site I put into the “redirect to” box, firefox always gives error “This site is not redirecting properly” and suggests clearing cookies, which does not work.
If I just deny the source address, it works, web browser displays “forbidden”, etc. But I cant redirect non pay users to a web page on my server (internal server).

Internet explorer doesnt work either.

Any ideas?