I have tried to set this up. I have my hylafax behind a firefax. I have open the ports 4559, 4558, 21, And also even port 4557 to nat to port 21 at server.
In the configure. I set my server ip address and port info. Under the Eprt I have it set to this Ip of the firewall that my computer is behind. I have it set to Active mode also. As port 21 or 4557. When you have the active mode turn on and then try to send a fax. You will get this error. EPRT: command not recognized. My computer is win 10 1803 64 bit.
Can you please look into this. Thanks.
This is some FTP ALG screwing the protocol. Why are you using port 21?