I've been having issues with my 1.15.2 Spigot Server. All of the files are working correctly, and load up like usual. I've port fowarded the port on my wifi router and done everything necessary. However, my friends from other networks cannot join the server but my brother in my wifi can. I have no idea why they cannot, as I set it up like the tutorials have told me.
It would be great if someone assisted me with the issue.
I can provide screenshots if needed.