Before trying anything else, make sure you are running the VPN service as administrator.
If that still doesn't work, continue as administrator and do the following:
Navigate to your MATLAB installation folder. From there, go into the version folder, and then further into the licenses folder. For example:
In this folder is a text file named network.lic which contains the information needed to access the license provided by the university. Append " 38001" onto the end of the first line and save the file.