This guide was created with the following products: Gravel Host Minecraft Server
If you are trying to join your server and you are getting the error Failed to verify username then it's probably due to you are using a pirated version of Minecraft. Follow the steps below to solve this error.
Cracked servers are highly vulnerable to hackers and raiders, we encourage you to turn on whitelist and use some type of login plugin.
Files tab from the left sidebar.
server.properties file to edit it.online-mode: true and set the value to false.