If you opened a server recently and nobody can join server even if you did port forwarding correctly, there might be an issue with your firewall, and you will need to add rule in your firewall to allow forwarded ports. Follow this tutorial to add a rule in your firewall.
First, you need to open Windows Firewall, open "Run" window by hitting Win+R, type "WF.msc" in it, then hit Enter.
You should get a window like this:
Then on the left panel on the window, there are "Inbound Rules" and "Outbound Rules".
Click on "Inbound Rules", then on Right panel, click "New Rule..."
Clicking on it will open a pop-up. On first step, click on "Port" and then "Next".
On second step, window will ask you to choose protocol type and ports.
Choose the protocol you want, choose "Specific local ports", and then put the port you want to allow.
On third step, window will ask you to allow or block this connection. Choose "Allow the connection".
On fourth step it will ask which profiles to apply this rule, check all profiles.
On final step, it will ask you to name your rule, and an optional description. Name of the rule will help you to find this rule when you need it.
When you done, click Finish and you should see the rule added in list.
Now, you need to do the same steps on "Outbound Rules". Follow the same steps just like how you did for "Inbound Rules".
Click on "Outbound Rules" and click "New Rule..." on the right panel.
Choose "Port",
Choose your protocol and put your port in,
Allow the connection,
Check all profiles,
Give it a name,
And you're good to go!
You will need to repeat this entire process for all of your ports.
If your port serves both on TCP and UDP, you will need to repeat the process to add other protocol.
If adding rules didn't work, you may need to restart your computer/server for changes to take effect.
If you want to suggest or report something, let me know in comments.
Enjoy!
