Hi, I having been using airtel broadband for 1.5 years and never had this problem.For approx 3 weeks now i frequently get "Server Not Found" error msg in FF randomly for different websites..I tried Opera and IE8 but i am having same problem with them too....i about 2 months back re-installed winxp and since i didn't have the tcp/ip configuration.......i set it on default which is "obtain ip address automatically"Now,in my view i think i am experiencing this problem due to non-configuration of tcp/ip properties...