[Zope] FTP and firewall

[Robert Jean]

Hello,

For users on the internal network, the Zope 2.6 FTP
server works fine. However, we wish to expand the
application to distributed clients over the internet.
The hardware used is a CISCO PIX 501 firewall. The
current settings are as follows:

access-list outside-in permit tcp any host <WAN IP
ADDRESS> eq 8021
static (inside,outside) <WAN IP ADDRESS> xxx.xxx.x.xxx
netmask 255.255.255.255 0 0

The problem is, I suspect as per the FTP protocol, the
client decides the local socket of the data channel
(not very good for firewall support). However, I have
been successful with other standard FTP servers using
similar treatment. Is there a resolution to this
issue?

Thank you,
Robert

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