Mcafee Error con ftp

no es posible conectar a NAI con el FTP client, bajo ningun punto

error 500

y no acepta usuario ftp.nai.com ni tampoco Anonimous@ftp.nai.com

alguien tiene el mismo problema ?
si lo ha resuelto ,,,, porfis una ayuda

Entrete

Works perfectly fine here:

[22:46:47] SmartFTP v4.0.1216.0
[22:46:47] Resolving host name "ftp.nai.com"
[22:46:47] Connecting to 12.120.18.237 Port: 21
[22:46:47] Connected to ftp.nai.com.
[22:46:50] 220 ProFTPD 1.3.3 Server ready.
[22:46:50] USER anonymous
[22:46:50] 331 Anonymous login ok, send your complete email address as your password
[22:46:50] PASS (hidden)
[22:46:50] 230 Anonymous access granted, restrictions apply
[22:46:50] SYST
[22:46:51] 215 UNIX Type: L8
[22:46:51] Detected Server Type: UNIX
[22:46:51] RTT: 152.975 ms
[22:46:51] FEAT
[22:46:51] 211-Features:
[22:46:51] MDTM
[22:46:51] MFMT
[22:46:51] TVFS
[22:46:51] MFF modify;UNIX.group;UNIX.mode;
[22:46:51] MLST modify*;perm*;size*;type*;unique*;UNIX.group*;UNIX.mode*;UNIX.owner*;
[22:46:51] REST STREAM
[22:46:51] SIZE
[22:46:51] 211 End
[22:46:51] Detected Server Software: ProFTPD
[22:46:51] PWD
[22:46:51] 257 "/" is the current directory