Why does my mac book not connect to my VPN?

I'm studying abroad in China and I have access to a VPN through my university in America. I'm able to connect to the VPN but it still will not let me get on Facebook, Google and other blocked sites in China. I use the same VPN for my iPhone and iPad and it works great. I have contacted my school but the IT guys were not too much help.
Is there any setting on my Macbook that would be causing this? Any ideas?

What VPN service you are using? Is your VPN support Mac?

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