Even with AVAST temporarily turned off I cannot get to a specific site with Firefox and Chrome. It times out. One of my colleagues at a different location cannot get it either, but the other one at a different location again can get it.

My cell with WIFI disabled can get to the site (Firefox).

When I PING it in command it times out as well.

Council insists the site is up. If my router is playing up for some flipping reason why would my college not get it either?

What can I do?