Quote Originally Posted by CybertecOne
Check your host file, and otherwise it sounds like a ipstack issue.

open command prompt and type "netsh winsock reset" without the quotation marks. Providing your DNS is correct and the issue is not browser related it should fix the issue.

Have you tried a different browser?
The fact that he has issues with the machine behind a switch and a second computer connected to the router lead me to believe it is a hardware error or conflict.