...my Proxy server for internet? While the network is OK and Proxy Server too is working fine, I suddenly loose the connection to my Proxy for internet and after sometime when I try I could browse normally. I use windows XP Proff. edition with service pack 2. IE 6.0.2... What could be the reason? Is it something to do with my Proxy software or with my windows firewall settings? Please give us some clues / suggestions? Thanks

Are you using windowsISA server? What versions? If so, the proxy server has had a bug with disconnecting the outside card (public) and refreshing it again in a few seconds. I had seen this happen with windows ISA server2000. Usually upgrading the ISA version corrected the problem in most of my cases.