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This gives me a 403 Forbidden error message.

It looks like they are checking the referer and serving 403 to visitors from HN.

Just press enter in the address bar once you have the 403, the same request will be done without a referer and it will load fine.

Thank you for this. Any idea why they would 403 visitors from HN?

Server load.

Pretty damn silly, many web sites would kill for the traffic of getting on the front page of HN. Maybe they mistook it for a DOS attack.