Mqtt server bot working when remote access activated

I am using duck dns for remote access, i cannot use mqtt server while it is activated…
What ia the soultion to use mqtt server?Preformatted text![Screenshot_20181006-133800|250x500](upload://iOM9azMTRFZwMV8hU1eSfbmzQDi.jpeg)

I have no idea and your picture is not showing up.