If you installed some antivirus across those machines? When I hear your complaint I usually find the owner has done something across the board.
I have a specific website which refuses to load across multiple devices (2 x PC, iPad, 2 x Android Phone), using different browsers (Chrome, IE, Safari), and even on mine and my wife's android while the Wi-Fi is turned off, and on the 4G network! I've confirmed that the website is up, other people at work can access it.
https://wmtscheduler.faa.gov
I ran a "tracert" command which completed fine. I'm getting "ERR_CONNECTION_RESET"
What in the world is going on?


Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic