In all your RFTMing have you hit the proftpd NAT mini howto?
http://www.castaglia.org/proftpd/doc/contrib/ProFTPD-mini-HOWTO-NAT.txt
It's short.
It makes reference to a global config directive:
http://www.proftpd.org/docs/directives/linked/config_ref_PassivePorts.html
It seems you're getting close.
>
> I RTFM, I read the online FAQ's and assorted other documentation and I
> still can't find any mention of this problem. I am thinking that possibly
> one of the more macho of you geeks has encountered --and solved-- this
> problem and would be willing to lend the benefit of your experience.
>
> Please?
>
> Bill
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