FTP - Can't login

Hello,

i have a problem: I can't login to the FTP-Server. He doesn't even send the username or password - he only says:

Resolving host name ftp.wz.cz...
Connecting to (ftp.wz.cz).
Connected to (ftp.wz.cz) -> IP: 212.71.128.30 PORT: 21.
Socket connected waiting for login sequence.
Cannot login waiting to retry...

What can I do now?

Thanx

Disker
No `ftp.wz.cz`, but `ftp.webzdarma.cz`

Radek
It's the same when I use this adress.

Resolving host name ftp.webzdarma.cz...
Connecting to (ftp.webzdarma.cz).
Connected to (ftp.webzdarma.cz) -> IP: 212.71.128.30 PORT: 21.
Socket connected waiting for login sequence.
Cannot login waiting to retry...

Thanx

Disker
try set up passive mode.
Now I used a different FTP-Program and I have set up passive mode but he still says:

Finding Host ftp.webzdarma.cz ...
Connecting to 212.71.128.30:21
Connected to 212.71.128.30:21 in 0.190, Waiting for Server Response
Connection closed by remote host.

He even doesn't send the login data!

Plz help!!!
Thank you very much!

Disker