I have a shared host in the States (I'm based in Australia) that is inaccessible from our internet (up to 3 computers using our ISP connection are receiving `Problem loading page` in FireFox).

Everyone else seems to be able to see the sites fine. Downforeveryoneorjustme.com says it is up too.

How could this happen?

Here is some info

* No proxy
* Down on multiple computers (no playing with hosts file)
* Noone was touching the router config at the time they went down
* We have reset the router / modem
* We have been on the phone with the ISP and the host, and they say it's up
* All machines in the office are running Max OS X
* I am able to ping the IP address of the host and get all packets returned successfully

Thanks