Make sure you have port 20 (udp and tcp) open.

On Mon, 24 Jun 2002, David Busby wrote:

> List,
>       I'm using iptables as my firewall to protect my internal network.  I 
> would like to be able to PASV ftp through the firewall.  When I use my 
> W2K machine as the NAT-Firewall I can connect and issue PORT commands to 
> the server and connect.  If I use my RH machine as the NAT-Firewall my 
> hosts choke when issuing the PASV command to the FTP server.  The server 
> responds with a 500 invalid port command.
> 
> Any assistance?
> I've got ip_conntrack and ip_conntrack_ftp kernel modules loaded.
> My firewall is only stopping incoming ICMP packets (for now)
> My input chain is set to accept.
> 
> TIA
> /B
> 
> 
> 
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