Another VPN option to provide connection to use Microsoft Remote Desktop to reach WSLH PCs is UW-Madison's Palo Alto Global Protect client. The following link provides instructions from DoIT to install, configure, and use this VPN service on a Mac OS X computer...
https://kb.wisc.edu/helpdesk/page.php?id=73116&no_frill=1
If using public Wi-Fi, it’s a good security measure to connect to a VPN soon after connecting to the Wi-Fi, even if not using Microsoft Remote Desktop.