I installed advanced port scanner
when I scan port 20 to 20 range, it says "Ports (0 opened, 1 closed)
When I scan 21 to 21 range it says "Ports (1 opened, 0 closed)
When I scan 20 to 21 range it says "Ports (1 opened, 1 closed) and a sublink sais "21 open (ftp)
But I am not using FTP somehow something keeps it open anyway to know what?