VPN says "successfully connected" and I'm internet-connected, but I can't access network resources

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http://askubuntu.com – To explain, I'm a university student who uses the VPN to access sites like Nature, PhysicsToday, etc. I have this VPN working on Windows 7 and I've got access to nearly every journal. However on my Ubuntu 12.04 partition I'm able to connect to the internet (in fact I'm typing this while connected through the VPN presumably) but journals have locked me out. Is there a problem on my end that I can fix? (HowTos)