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Receptional_Andy - 1:48 pm on Dec 9, 2008 (gmt 0)
I assume their system is just set up to drop requests that don't appear to be from a FQDN.
Google shouldn't need to access the site at all - they take self-reported data from your users. If a user on your intranet is able to also send requests to the GA server, then stats will be recorded.