I can't open the port, what's the problem?

Question

Computer networks

Previously, everything worked out like this 2 years ago) only the axis changed during this time)
The problem is that I can’t open the port, any (but for example, take 25565 "Main server port, as it is for checking")
I must say right away that I have a dynamic SP ..
The port is closed precisely from the "Outside" inside it works and the
modem settings screen is open:
What do you advise? Windows 10, the firewall is off and I use casper, but for checks I’m off ... The

provider says that everything is in order, we do not block ports, you have a problem ..

Answer 1

Is your address white? Most likely you are behind NAT

Answer 2

I came across a similar one, in my opinion I did something with the firewall settings (on the gateway). Either he turned it on, or vice versa.