ncftp can't put file!

[Pun Kuan Tou]

I am using testing debian, the ncftp can't put file to myisp
a/c!

the error is...
 ------
/ ncftp /public_html > put index.html
| Invalid reply: "."
| Passive mode refused.
| put index.html: PORT failed.
| ncftp /public_html > ls
| Invalid reply: "."
| List failed.
\ ncftp /public_html > 
 ------
what's problem in it?
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