Connect error if use proxy server

To anyone who can help,

When i'm using smartftp in my university which use proxy server, i got error message like this :
[21:40:11] SmartFTP v2.0.996.29
[21:40:14] Resolving host name "172.18.75.12"
[21:40:14] Connecting to 172.18.75.12 Port: 21
[21:40:14] Connected to m4sterkom.1500mb.com.
[21:40:20] 220 ProFTPD 1.2.7 Server (ProFTPD Default Installation) [gw-ilkom.ilkom.fmipa.ipb.ac.id]
[21:40:20] USER m4sterkom.1500mb.com@m4sterkom.1500mb.com mzuhri
[21:40:20] 331 Password required for m4sterkom.1500mb.com@m4sterkom.1500mb.com.
[21:40:20] PASS (hidden)
[21:40:20] 530 Login incorrect.

Do u have an idea what is going wrong ?
Although i have configured the proxy address, n give the right username n pass to logon the proxy, the error message still appear.
I'm very glad if anyone outhere can give any idea to solve it.


To anyone who can help,

When i'm using smartftp in my university which use proxy server, i got error message like this :
[21:40:11] SmartFTP v2.0.996.29
[21:40:14] Resolving host name "172.18.75.12"
[21:40:14] Connecting to 172.18.75.12 Port: 21
[21:40:14] Connected to m4sterkom.1500mb.com.
[21:40:20] 220 ProFTPD 1.2.7 Server (ProFTPD Default Installation) [gw-ilkom.ilkom.fmipa.ipb.ac.id]
[21:40:20] USER m4sterkom.1500mb.com@m4sterkom.1500mb.com mzuhri
[21:40:20] 331 Password required for m4sterkom.1500mb.com@m4sterkom.1500mb.com.
[21:40:20] PASS (hidden)
[21:40:20] 530 Login incorrect.

Do u have an idea what is going wrong ?
Although i have configured the proxy address, n give the right username n pass to logon the proxy, the error message still appear.
I'm very glad if anyone outhere can give any idea to solve it.
possibly you need to configure some public directory to access. Some ftp servers give that error if you dont put, for example /pub as initial directory
cheers