Answer
It means the wireless connection requires password.
Step-by-step explanation
VPN is virtual private network. It extends a private network across a a public network.This helps or enables the users to transfer data across the shared or the public network as if their computers are directly connected to the private network.
If the server desktop does not appear on the screen it means it has added the feature that encryption is enabled to that that no computer can decode the data packets. so It means the wireless connection requires password.