Perhaps your server has been blacklisted, temporarily or longer term, for e.g. too many requests. That isn't necessarily your fault if you are sharing hosting with others.
This post (from searching "403" in this group) might help you investigate further http://groups.google.com/group/google-maps-api/browse_thread/thread/577bf1392fc53897/cf3127bfea821767 -- You received this message because you are subscribed to the Google Groups "Google Maps API V2" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-api?hl=en.
