# openfortivpn > A VPN client, for Fortinet's proprietary PPP+SSL VPN solution. > More information: . - Connect to a VPN with a username and password: `openfortivpn {{[-u|--username]}} {{username}} {{[-p|--password]}} {{password}}` - Connect to a VPN using a specific configuration file (defaults to `/etc/openfortivpn/config`): `sudo openfortivpn {{[-c|--config]}} {{path/to/config}}` - Connect to a VPN by specifying the host and port: `openfortivpn {{host}}:{{port}}` - Trust a given gateway by passing in its certificate's sha256 sum: `openfortivpn --trusted-cert {{sha256_sum}}`