Starting PTV Vissim/PTV Visum fails with an error message: 'You are using an academic license. In this case the telemetry servers must be reachable. Please ensure that this computer is connected to the internet and then restart this program'
Probably you are unable to connect to the license server because of firewall/proxy restrictions. Please ask your local IT-Admin to open port 22455 TCP & UDP temporarily for you. This is necessary to borrow the license successfully.