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I'm seeing weird requests in my access_log - - [24/Jan/2010:09:37:29 +0000] "CONNECT HTTP/1.0" 500 10488 "-" "-"

None of those IP's are mine: - this seems to be from china - this one from US

Any ideas what this might be?

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up vote 5 down vote accepted

Yes, it's someone scanning servers to see if they can tunnel through them by using the CONNECT verb. It's failing (HTTP response code is 500), so it's nothing to worry about. You'll see lots of this with your web server open to the world. is the client IP address, and is the address the client wants your web server to tunnel to.

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