A rejected connection to a RustEZ server with the message "Steam Auth: gamebanned" means your account has an EAC ban. The effects of the game ban are determined by the developer. This is not a server-specific ban that we can assist with. More information on Game Bans can be found here, in Steam Support.  https://help.steampowered.com/en/faqs/view/46DB-4CEC-F7E9-49E5