WHERE: https://community.bistudio.com/wiki/DayZ:Error_Codes

SECTION: "Error categories and Codes > 0001 - Error when connecting to a server"

EXACT CODE: "0x00010009 - DLC_CHECK_FAILED This server is running Livonia DLC that is not owned."

EXPLANATION: Since Livonia has been made part of the base game, the DLC name is obsolete AT LEAST in the documentation, I have no simple way of checking this on the client since I have the DLC.