I'm trying to create a Minecraft server but I can't access it, why?

Question

ubuntu

I created a server and it seems to start up and everything is fine, well, for some reason I can’t log in to it, although I made a permanent IP, DNS. I tried everything, it seems, and reached a dead end, if someone knows, please help!) "If you need to attach something, I'll attach it"

Answer 1

1) First you need to go to the settings of your router, if you use one. Enter the DHCP configuration and manually assign a local address to the computer / laptop. The fact is that with each reboot of the router, or every 2 hours, your local IP will change. You need to make it static. It looks a little different on different routers, but the essence is the same:
1 - Select a device from the list or enter the MAC address of the network card with your hands
2- Assign an IP (such as 192.168.0.40)
2) Without leaving the router settings, go open the port. How to do it - google. A bunch of information on any model of the router. Assign port 25565 (default for Minecraft) to your static IP address, which you yourself registered.
3) Reboot the router, there is nothing else for you to do there. Open the server config file, in it:
- change "online-mod=true" to "false"
- whitelist= false
- ip-adress= (don't change anything, leave it blank)
That's all, I can't remember anything else.
If you are going to play on the Internet, then you need to make sure that the provider gives you the opportunity to open ports yourself. If that doesn't help, install the Hamachi client or something like that, start the world in a single player game, open it for the network in the pause menu, connect using the Hamachi procedure.
If you play at home on the network - just open the world for the network from a loner. It became available in the latest versions for sure. Downloading a server separately is already redundant for such a purpose, especially since performance is lower with a separate server. And mods work anyway, it's enough to have 2 identical clients with the same set of mods.
Did this on Ubuntu 16.04.6. Played between Ubuntu 16, Windows 7, Windows Vista at the same time.