If you tried to login to the FTP server with wrong password several times you will be blocked in our firewall.
There is a timelimit on that block and will be removed when the limit has passed. 

This is for exstra secutity. 

The same goes for Email, POP3 / IMAP / SMTP / cPanel


Please open a support ticket and add your ip adress if you have any problems with "no response" from our servers.