FTP ALG problem to your FTP server
ZyWALL 110 V4.33(AAAA.0)ITS-WK30-r89425
I have no rule that allows like from DMZ to WAN all services I allow like service port 21 and the ALG in the ZyWALL allows the other ports be it in Passive or Active mode.
works fine in Passive or Active mode with firewall on
does not work in Passive or Active mode but with firewall off Active mode is forced to Passive and works.
using Core FTP LE 2.2