Firewall Ports

ServiceTCP/IP PortDescription
FTP21Initial port used for FTP, used for connecting, logging in and issuing commands
FTP and FTPS30000 to 30100Data-Ports used for Data-Connections (directory-listings and file-transfers).

These ports *MUST* be opened and port-forwarded in order to offer FTP to clients on the internet
FTPS21,990Explicit vs Implicit Mode

These two ports are used for connecting, logging in and issuing commands.
SFTP22Standard SSH port, used for all communication (does not need PASV)