Not sure what features Norton may use for their update feature so I can't say positively although I wouldn't think that it would be using an inbound teredo tunnel, but I do not think that there would be any reason that you couldn't uncheck any of the services that are presently checked then reboot your machine and test to see if Norton isn't functioning properly. If you notice any detrimental results as a result of unchecking access to a particular service then you can always go back and re-check it. As I mentioned earlier, I have the two Skype services unchecked and am able to use Skype normally. Chat and computer to computer skype calling in and out, however I don't have a skype number nor a webcam so I don't use some of the more...