When I try to Join the server with the ip mc-gtm.net, it says: Network is Unreachable. Can someone help me?
Going off what Taco said, also try restarting your router. If all of these suggestions fail, reinstall minecraft, or contact your ISP.
A few tips: - Make sure you are on a good internet network - Make sure you are on an acceptable version (preferably 1.12.2) - Make sure you are using a vanilla client (i.e. remove all hacked or illegal clients) - Make sure you are not using a VPN