On the other hand, I hope until this reviews about it Watchguard Mobile Vpn With Ssl Mac Os X And Watchguard Vpn Ssl Vs Ipsec will become useful. From the docs: 'To install the Mobile VPN with SSL client on macOS, you must have administrator privileges.' Did you when you did the install? If so, try the V12.5.2 client or open a support incident to get WG help in getting this working.
You can install the Mobile VPN with SSL client software on computers with these operating systems:
If the client computer has Windows Vista or Windows XP, you must log on with an account that has administrator rights to install the Mobile VPN with SSL client software. Administrator rights are not required to connect after the SSL client has been installed and configured. In Windows XP Professional, the user must be a member of the Network Configuration Operators group to run the SSL client.
If the client computer has Mac OS X, administrator rights are not required to install or use the SSL client.