TCP
FTP Control
What port 21 is used for
FTP control channel — commands and responses.
Security considerations
Passwords travel in cleartext. Migrate to SFTP (22) or FTPS.
Check if port 21 is open on any host:
Open Port Scanner →FTP control channel — commands and responses.
Passwords travel in cleartext. Migrate to SFTP (22) or FTPS.
Check if port 21 is open on any host:
Open Port Scanner →