How to establish a Serv-U Ftp server with port mapping to access the external network?
If the FTP server is established by the client, you can set it on the client, create a DNS server on the computer connected to the external network, set the mapping between the domain name and the address of the FTP server in DNS, and change the port of the FTP server to 5050, so you can enter the corresponding port by entering ftp://IP:5050.