If you use a PC Firewall like pathetic Nortons and think it a good idea to switch off browser referrer info - which the server has already obtained anyway, or use a browser like NS which by default set-up stupidly uses cache totally as if off-line, then this and any server has the right to consider you a risk and you will experience problems because of lack of STANDARD HTTP conversation protocols. But of course as a webmaster on a network you should already know that!! ...and appreciate CGI software which reacts that way to your visitors.