We're aware that Mac OSX Sierra VPN setup requires an IP address of the server rather than a Servername

IP addresss are likely to change from time to time, so we generally don't publish them, however, to work around this for Sierra, do the following.

1. open a new terminal window

2. Type nslookup and then the servername 

nslookup usa1.vanishedvpn.com

3. The ip address will be at the bottom of the response

Non-authoritative answer:

Name:    usa1.vanishedvpn.com