FTP via Squid Error

Dear All,

I meet same problems for the FTP via Squid Error, but many search
result have not provide the soultions, please advise how to solve it,
thanks so much!!!

PS : if i bypass squid, i can access the ftp server.


------------------------------------------------------------------------------------------------------------------------------------
An FTP authentication failure occurred while trying to retrieve the
URL: ftp://abcd.com.hk/

Squid sent the following FTP command:

PASS <yourpassword>and then received this reply
Login incorrect.