Hint Generally, it is recommended to use the .ovpn file which is including DDNS hostname. A DDNS hostname is very convenient because when the corresponding IP address will be changed, the IP address of the DDNS hostname record will be changed automatically. However, from some countries or regions, DDNS service might be unreachable. In such environment, the domain ".opengw.net" cannot be resolved. You should use the .ovpn file which is including IP address. If there are both TCP and UDP links, you can use one of them. Generally, the host which port number is less than 2000 can accept VPN connections stably. TCP is more familiar with most of firewalls, however UDP can achieve faster throughp