Although I am not Microsoft Certified, I have been building computers since 1980 and PCs for 13 years, I build or repair the odd PC about once or twice a month. I have spent quite a bit of time on trying to resolve this issue and thus far a full resolution eludes me.
The ipv6 issue is not relevant here. It makes no odds if I remove this protocol or any of the other unrequired protocols, the issue remains. I am running a simple LAN set-up, cable modem connected via ethernet cabling. I do also have a 2nd pc connected via a second NIC, but this machine is rarly on, certainly not so when this issue occurs, or having been on before the stop.
The "Network Connectivity" sevice is running and interestingly enough, already established IP connections continue to function, e.g. peers. I do lose trackers though. It is only when one tries to establish a new connection, browse the web, I dont really use MSN, but I guess that wont work either as I cant connect to smtp or pop.
I have set my NIC never to sleep. I have adjusted all the power options to my needs in Vista.
The solution was to close all open programs and reboot, far from ideal. After a little tinkering, I found stopping(not restarting) network connectivity service and then starting it again, restored my access to the web and precluded the need to reboot. This would generally fix the issue until I have to reboot for whatever reason, then the cycle begins....
I was blaming p2p for the issue, until one day, I inadvertently left the PC on, no programs running, came home from work, to find I had lost connectivity once more, the usual stop/start service did the trick. The plot thickens.
I have had Vista RTM since Jan 23 and had this issue from the start. The above is the only work around I have found. I have found others who have experiened this issue since the Betas and posted my fix to them. Nothing seems to be in common in the set-up, and this install of Vista is about my 10th go, as I have been plagued with some nasty issues, like exploading psu's corrupting BIOS chips, dodgy ram sticks causing issues, good ram sticks causing issues, crap Mobos(due to panic and no availibility of 939 agp boards), swapped and then swapped again until I was back to my original board, which Abit swapped foc. Phew, it has been a Windows experience all right this year so far!