Help setting up EX4100 outside access with dynamic dns ASUS RT68U

So I’ve done all of the things I’m supposed to do (I think) but I still can’t access from outside. Here is a list of what I’ve done. What am I missing? Thank you in advance.

  • I have an assigned public IP from ISP.
  • Registered a ddns and it’s running on the router (Asus RT-AC68U)
  • Forwarded port 2121 to internal 21 to IP of ex4100.
  • Forwarded the passive ports 55536:55663
  • IPv4 Network Mode Static IP on EX4100
  • FTP Access ON
  • Report external IP in PASV mode OFF
  • Explicit TLS ON
  • Dynamic DNS in EX4100 OFF