I cannot connect to my workplace VPN
I've had trouble with VPN before on my setup. I fixed my problem, but I had to do a couple of weird things first. Could you tell me more about your settings?

Under System > Preferences > Advanced... 


Under (tab) DNS > DNS Servers: Do you have your DNS servers set?

a. If so, are they something like 192.168.0.2 and 192.168.0.4?
   You may need to change your home router's IP address if so.
Under (tab) DNS > Search Domains: do you have a search domain set?
ie. domain.local


I hope changing those settings helps. If not let me know and I'll try to help. VPN has been enormously frustrating for me in the past.