Why is Xcode trying to access 'cs193p.dyndns.org'

Yesterday I installed Xcode 4.2 GM, today connected my iPhone (installed with iOS 5 GM) and clicked the "Use for Development" button in Organiser.

I was them confronted with this dialogue.

The site http://cs193p.dyndns.org hosts some "Profiles", clicking on then download a profile and atte开发者_如何转开发mpts to install it:

(I clicked cancel)

This new System Preference then appears:

I have know idea what this is or even if I should trust it.

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cs193p is the Stanford course code for Paul Hegarty's iTunesU class. Maybe you're using the helper ObjC class he offers for managing FRCs? If so, check that code for references.