how can i connect a ftp

[kilburn]

Your proftpd isn't working properly. There's a lot of people that had the same problem as you recently so take a look at the other threads, they'll probably give you a solution.

If it's not the case, please post the relevant log lines from /var/log/syslog and your proftpd's config file so we can trace your problem.

PS: Take a look here too