Since June 1st, users are now require to verify via Discord. Here's how.
To verify, you must attempt to join the server with the IP address Korbscraft.com. A message should show up on screen including a 4-digit number, write this number down, you'll need it.
Join our Discord server and find the bot in the members list, right click on the bot and click Message.
Send the bot the 4-digit number that was provided by the server. Once the number has been sent, the bot will verify your Minecraft account. If the verification was a success, then you'll now be able to play on our server. If the verification was not a success, contact the owner from the Discord server.