[CentOS] iptables question

Hi all,

With SELinux in permissive mode and iptables running, I'm unable to
retrieve directory listings with ftp.

stop iptables, and all appears again.  This seems to be unrelated to
passive/port modes for ftp client.

If this is off topic, please let me know offlist and I'll take my
question elsewhere.  Otherwise I'll repost with output of

# iptables status

TIA,
~Ray