Unable to connect over proxy

Hi,
I am a new user trying to connect for the first time. I am using SmartFTP on Wondows2000.

I am getting the following error:

Resolving host name xxx.xxx.xxx.com...
Resolving host name ftp.yyyyyyyyyyy.com...
Connecting to Proxy (xxx.xxx.xxx.com).
Connected to Proxy (xxx.xxx.xxx.com) -> IP: XX.XXX.XX.X PORT: 80.
HTTP/1.1 502 Proxy Error ( SSL port specified is not allowed. )
Cannot login waiting to retry (120s)...
Connection closed.


xxx.xxx.xxx.com is my internet proxy.
ftp.yyyyyyyyyyy.com is the remote host
Mode = PASV
PORT IP Mode = Default
Force Server IP for PASV mode is checked

Has anyone every gotten this error?
Any ideas on how to resolve?

I am able to connect by entering this into IE:
ftp://XXXX:xxxxxx@ftp.yyyyyyyyyyy.com/


Thanks,
jbird