How to use a cracked client like tlauncher?

By default, only premium Minecraft accounts can join. Change the online-mode setting to allow cracked launchers such as TLauncher.

<ol><li>In the control panel, click on your server and click Server properties.</li><li>Scroll down to the online-mode field.</li><li>Change true to false.</li><li>Restart your server.</li></ol>

<pre><code># in server.properties online-mode=false</code></pre>

With online-mode off, anyone can join with any name. Use a whitelist or an authentication plugin to keep control of who joins.