Remote control via duckdns suddenly stop works

Hi all gentlemens,
I checked this community with similar topic, but I didnt find out answer for my issue, or I dont understand whats going on (sorry, but please help me).
I use remote acces via duckdns , but one week later I lost connection suddenly and until now i am not able to connect to HA anymore.
I did nothink with update or kind of like this. What I have done:

  • chceck connection status
  • rescan wifi and again connect to my network by CLI commands
  • turn on/off HW
  • again check connection to my home network

How / what i should follow any steps to solve my issue? Can someone advise me , please?

port forwarding, but I mentioned before, I did change nothink.