Check your firewall settings on the server and client. Allow incoming and outgoing connections for TCP COM Bridge.
2. If you send data through the Internet, you should use the server's public IP address on the Internet. Such IP address cannot start with "192.", "172.", "10.". Please, note that VPN networks may use special addresses.
3. If you send data through the Internet, probably, your server is behind a router. It would be best if you redirected a TCP port on your router to a physical server. Ask your network or system administrator if you do not have access to these settings. Also, you may try to activate the "Enable UPnP" option on the "Server mode." tab (note, UPnP can be disabled in your network).