How can i play halo 2 online on xbox 360?

i got xbox live gold and its connected to the internet but when i want to play halo 2 and want to sign in to my xbox live account, i cant it says ether cancel or start troublshooter. i run troubleshooter everything is fine, i dont know whats wrong, i use to play halo 2 online with the same xbox 360 like a week ago and now i cant play, please helpHow can i play halo 2 online on xbox 360?
It's Because service for the Original Xbox Live was pulled two days ago, you can no longer play Halo 2 or any original Xbox game online.

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