Macbook pro late 2011 cannot access windows based server through VPN
When you were at the office, did you use a different network like a AT&amp;T/Verizon/Sprint hotspot?  Next time, try testing at a Starbucks or another public wifi first.

More than likely the VPN server dosen't allow loop backs (meaning you are in the network to start, go out, to come back in).  It probably just connected you.

What VPN (server) are you using?  What error message did you get?

In my past experiences, I have found that SSL VPNs are the way to go especially with Macs.