This means that the server is temporary down or that you have entered the address/IP address incorrectly.

Double check the address is correct, and ensure your firewall might not be blocking you from joining the server.

There are two reason this might appear:

1. You aren’t using a official Minecraft account. To join the server, we require a official Minecraft account in order to make it possible to enforce our rules and to protect our server from any attacks. We recommend looking at the website gg.deals to get a Minecraft account officially and as cheap as possible. We are not responsible for any content outside of this website, nor any issues which may occur when using gg.deals
2. You have a invalid session. Simply close Minecraft and re-open it to start a new session

You have a invalid session. Simply close Minecraft and re-open it to start a new session