I have a PPTP VPN server set up on Ubuntu VPS and it works OK on my Mac, but when I connect to it on my Windows 7 machine, most sites work, but for some reason some others do not work – browser just can't reach them (they do work on Mac however). I can ping these sites. I have tried different browsers, got same result. One example of a site that doesn't work on Windows through VPN is http://qbank.ru
I have no idea how to troubleshoot this, any ideas?