I opened a Minecraft sever on the port 25565, did every portforward thing correctly. Even disabled Windows Firewall. But check the port to see if it's open or not, and it says closed.
I contacted my ISP, and they said that I'm not allowed to open any ports due to "Security" reasons, and if I want them to open a port, I would need to pay for an "Expert" plan. Which I find really ridiculous. I also tried to change the port to something else and it also didn't work.
If anyone has any ideas, please reply!