See this related question. Can you find/post a replay of a well executed proxy rush that is successfully defended against? (Not a counter-rush that succeeds, that requires pre-comitting to a rush. I mean a more durable strategy that successfully scouts and defends against this kind of rush).
Note the specific location I prefer for the proxy setup is around the gold that is near the opponents base, outside of usual scouting area and watch tower.
Edit - sorry, I wasn't specific enough. I marked my favorite spot for proxying on this map - this is a rarely scouted place. Also, recently I usually don't send a probe right on the start, but rather build my 2nd pylon there, then warp 3 gateways.