For the PORT command to work you need to allow a port command range thgough the router. ioftpd does not send upnp commands to the firewall thus it works if you set a fixed range of ports (and set the sme range in ioftpd). If you set upnp then depending on the brand of router, the fixed ports settings may be overruled.. Note, some routers do handle fixed and upnp ports together porperly...
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