VPN CyberGhost VPN tries to connect via 5443 on the following servers
(there might be more than the ones listed):
USA server: 38.95.109.53
Germany server: 185.93.180.67
Netherlands server: 77.243.189.212
A scan via
https://pentest-tools.com/discovery-probing/tcp-port-scanner-online-nmap# on the USA server IP address has the following result. Note the entry on port 5443.
PORT STATE SERVICE
20/tcp open ftp-data
53/tcp open domain
80/tcp open http
443/tcp open https
1723/tcp open pptp
3128/tcp open squid-http
3306/tcp open mysql
3389/tcp open ms-wbt-server
5443/tcp open unknown
8080/tcp open http-proxy
8081/tcp open blackice-icecap
8443/tcp open https-alt
9082/tcp open unknown
9091/tcp open xmltec-xmlmail