My brother-in-law has got a weird situation where their home PC's cannot access a specific site on the Internet. [Medlink UK](http://www.medlink-uk.org/ "Medlink-UK") which is a medical teaching site for his son.

I can access it fine, both from home (through our [O2 router](http://en.wikipedia.org/wiki/O2_wireless_box), which is the same as he has) and at work.

I tried the few basics I know, but no luck...

I had him open up a command prompt and he can't even get a ping response from the IP address of the Medlink site, compared his [tracert](http://en.wikipedia.org/wiki/Traceroute) to mine and it showed the packets going to the final hop before the Medlink IP address.

He does have full Internet access, other sites in the UK and abroad are working fine.

He's contacted the broadband supplier and they've checked his router, and even re-booted it but no joy.

Their comment is it's "something" to do with the site, which is in Houston, and it "needing to expand its IP address range" ... *this is what my brother-in-law remembered* ... so treat it with a pinch of salt.

What should I try to resolve the problem?