I've created a secure connection for Firebird 3(an open-source SQL relational database management system) using steps from there
now I can connect from a client to server using Open VPN connection:there is a IP assigned for the server and I can connect to database using Firebird default port (3050) It is possible to secure port 3050,only to be accessed only by VPN connections?
now It is allowed from the server firewall.if I block it from firewall no connection can access data.
thanks