Connected to VPN can't connect to domain at all
I have someone in Australia who's connecting back here for VPN. Once connected, ironically, all connection to our domain is gone. While off VPN, he can navigate to "OurDomain".com in Safari but once on VPN the link is broken. All IP addresses in the domain are un-pingable, yet, he's connected to the domain over VPN.
Anyone have a clue as to why or what I can look for?
Thanks
MacBook Pro with Retina display, OS X Mountain Lion (10.8.3)