Well as a server owner I know the only way is to run the server in offline mode. When it is in online mode(default) the server checks to make sure every account is premium. You can play on a server if online mode is set to false. This is a check mojang has put on to stop pirating on minecraft. So if you can't join the server is running with online mode on.
Chat with our AI personalities
You need a premium Minecraft account to play online with other people.
No, to play the full version of Minecraft, you need a premium account which has to be done online.
no if online yes if offline
No, but you can play on classic single player and if you have a account you can play on multiplayer classic
Go to Minecraft.net, log in using an account that had bought Minecraft and then click play in your browser under the Download Now! button on the main page. If you do not have an account that has paid for Minecraft then you can play Minecraft Classic for free.