Many users who cannot connect to Flygo 's FTP server may be because they are using a computer behind a fire-wall and that fire-wall was set to close any FTP port except 21 port, FLYGO's ftp port is 2121 so those people cannot connect.
It always happend when you are using your company's LAN to internet or sharing internet access via your work-unit's broad-band.
If this is the case, you should ask your network administrator to change the security policy of the fire-wall to enalbe any port be FTP prot.