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Internet connection sharing interferes with iChat screen sharing
Some customers have experienced a conflict bewteen iChat screen sharing and Internet Connection Sharing (ICS). The best way to resolve this is to disable Inernet Connection Sharing in the "Sharing" System Preference. Often times the function that was provided by ICS prior to disabling it can be replaced with a proper wireless router. In other cases, the ICS function was not needed at all, and was just activated by mistake.
Go to: "Apple menu > System Preferences... > Sharing" and UNCHECK "Internet Sharing".