So, one day I decided to be stupid, and hook up my xbox to a PC via ethernet. What I didnt know was that my PC (it was an old pc i hadn't used in a while) had an automatic internet connect process at start-up. After that process went through and tried to connect, and failed, the xbox gave me error 21. My xbox has an Xecuter 2 mod chip on it, and i recently bought this Xbox from a freind, about two weeks ago. If anyone knows what i should do please help me!