Create a manual IPSec Unifi Site-to-Site VPN
Configuring an IPSec site-to-site VPN between Ubiquiti Unifi gateways (USG/USG-Pro/UDM/UDM-Pro) is relatively straight forward process, but there are couple sticking points that can cause a hang up. This video walks through the setup for a manual VPN, when you can’t use the automatic config.