[CentOS] ftp problem

I have a server that is running iptables. I'm trying to allow vsftpd in
and have the following rules. I can connect to it, but when I try to do
a listing it says "Entering Passive Mode" but doesn't do anything. 

Any suggestions? 

Thanks,
James

# define it
-N FTP_INP
-A INPUT -p tcp --syn --sport 1024: --dport 21 -m state --state NEW -j
FTP_INP

# rules
-A FTP_INP -j ACCEPT

# go back
-A FTP_INP -j RETURN

-N FTP_OUT
-A OUTPUT -p tcp --sport 1024: --dport 21 -m state --state NEW -j
FTP_OUT
-A FTP_OUT -j ACCEPT
-A FTP_OUT -j RETURN