3. I can't connect to my own server but other people can
It's normal if you can't connect with your global ip to your server or website if you connect from the computer that hosts the server/website.
There are other IPs you can use instead.
You can try to use 127.0.0.1, your IPv4 address or add your domain to hosts and use your domain to connect:
Solved - Help with my webpage (https://otland.net/threads/help-with-my-webpage.223416/#post-2146872)
For further explanation:
Open your hosts file (C:/Windows/system32/drivers/etc/hosts in Windows).
I recommend to use notepad++ to do this incase you accidentally do
save as which will turn the hosts file in a .txt file when you use text edit programs like the default windows notepad and then it won't work.
If you can't save the hosts file, make sure it's only opened once and run notepad++ as administrator.
In the hosts file write your IPv4 address and next to that your domain.
Then add your domain in config.lua and use your domain in your IP Changer to connect to your server.
When you have the same problem when you connect from a different computer from the same network, you can do the same thing there, with the IPv4 address of the host pc.
Note: This workaround doesn't work for some older (Crying Damson) versions, for these versions use your global ip in config.lua and your IPv4 address in your IP Changer.