I have since NEN problem: I can't join server. Absolutely none. In the multiplayer menu is on all servers "Can't connect to server", and if I join anyway I get the error: java.net.connectexception: Connection refused: no further information
Did you try to restart Minecraft?
Or your Pc right?
Maybe you are not connected to the internet or it is too weak!
Actually, I only know the problem if you do not have internet, but since you wrote this article, I suspect that you have internet.
But if you have written the article on the phone, check the LAN cable (if you are using it) or the WLAN reception system (if you use it). You can do that by looking for something on the internet. If it does not do anything, you have to swap the part.