Had a strange issue with web sites not loading intermittently. For example, using Chrome I would get the error:
Error 105 (net::ERR_NAME_NOT_RESOLVED): The server could not be found
When a browser was loading a page it would say ‘Resolving host’ for ages and either return a blank page or ‘Website not available’
It wasn’t browser specific nor profile specific..I ruled out the router as had a Windows XP PC that was connecting at the same time without any issue or delay.
Assumed it was the networking within Windows 7 but did all the basics: checked Firewall, AV, ran netsh reset commands but to no avail. Even hard coded my ISP’s DNS servers into my physical NIC rather than straight from my router. Made no difference.
Finally found that if I hard coded the OpenDNS dns server entries to my NIC it worked! They are 220.127.116.11 and 18.104.22.168
The problem must have been linked to my ISP’s DNS servers’ not resolving for Windows 7 clients.