i have a news site i check stuff for regularly.. once in a while i cant access it completely from my 5 different browsers and even from the command line, nslookup cant resolve, ping and tracert fails.. all not being able to resolve site name..the problem is specific to this.. i am told by the site support person that problem is that its cache on my machine or on ISP and I say thats not true because this site I access it 1-2-3 times a week from one browser only.. i only fire up the other ones in times of trouble..and when i have the problem even if i try on my secondary machines i still get the same problems.. when problem goes away all works well.... question is whats causing the intermittent dns/http problems... i don't believe this is something to do with my machine because probe disappears without me having done anything at all.