I have a brand new Dell OptiPlex workstation (Windows 7 Pro 64bit)
For two weeks o,ut of the box I had it connected to an Ethernet port and the browsers works perfectly.
The owner then asked me to move it to a location that has no Ethernet ports but is in a good wifi area ( confimed with other laptops etc)
So I purchased the most expensive ASUS wifi adapter at our local tech depot and it connected right up to a good wifi router. But the next boot the browsers failed to connect to any web page ( port 80 problem ?)
I am a tech so the first thing I did was ping 126.96.36.199 ( perfect) And I can ping
"google.com) perfectly, so DNS appears ok. And my VPN software connects nicely.
So I tried a different wifi adapter. Same behavior ( sometimes it boots and browses but mostly not. I then turned of the firewall and (clue) it asked me to choose the public/work/home networks. and then browsed until I rebooted. I then MANUALLY added the DNS just in case. For more info this failure of browsers to work has been tested in two completely different buildings ( Cox on one and Comcast at another) Same behavior of the failure to browse but can ping any wan address (urls included)
GOD HELP ME this is a completely baffling issue to me ( and I am a tech)