Accessing Network named user license via VPN


We are using 2 network named licenses. One we are using within the organization. We have got one resource outsourced from other organization. He is trying to access the license from his organization(Remotely) via VPN, but he is getting server host not found error.

He has got access to the PC where in network named licenses are hosted. 

When he checked with IT, they are telling, Everything is set but we need an environment variable where we can set the host name and port details of server PC from your machine.

Can anyone please suggest on the environment details to be set while accessing network named license from client location via VPN.

Thanks and Regards,

Shilpa H J