Everything looks fine with ntl's dns...
>
www.dosth.com
Server: cache2.ntli.net
Address: 194.168.8.100
Non-authoritative answer:
Name: dosth.com
Address: 69.72.137.162
Aliases:
www.dosth.com
> 69.72.137.162
Server: cache2.ntli.net
Address: 194.168.8.100
Name: server5.24hostingnow.com
Address: 69.72.137.162
sounds like a local proxy issue, so try doing as Matt D suggested and specify a proxy server. You could also try browsing to the site (or indeed PCBD message) and then pressing CTRL + F5 or typing the address as
http://www.dosth.com/?1 and is if that makes any difference. Also clear you local cache files, and make sure you haven't put an incorrect entry for the site in the hosts file on your machine.
MB