You can change your IP address from the network settings controls menu on a Windows PC, Mac, and even your phone.

If a computer is unable to configure a valid Internet Protocol address, it can't connect to a network. If you plug a laptop directly into a modem with an Ethernet cable and receive a "No Valid IP ...

Two servers cannot have the same IP address. When you are using VPN you are going over the Internet which means the IP address you try to connect to will have to be a valid, (not 10.x.x.x or 192.168.x ...