The failed to verify username means that the Minecraft/Mojang authentication servers are down, this means that when you try and connect to a server it doesn't allow you.
You can check the Mojang server status' with the Mojang Status page on their help site: https://help.mojang.com
You can also follow the official @MojangStatus Twitter account for updates on all Minecraft/Mojang services. https://twitter.com/MojangStatus
Please note that this is not a problem on our end, you just need to wait it out until their servers are back online.If you require any further assistance, please contact our support at: https://shockbyte.com/billing/submitticket.php