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You might want to be sure that any redirection you have set up on your server is not inadvertently
redirecting requests for robots.txt. You can test by requesting robots.txt from your own site, and
checking to see if anything weird happens in the address bar (or elsewhere).
Otherwise, this is pretty strange, and hopefully Googleguy will kick this over the the Googlebot
crew for an answer.
Interesting mystery...
Jim
[216.239.51.100...]
[google.com...]
Although it seems unlikely to be the reason here, most servers would issue an HTTP redirect from the former to the latter if there is a directory named /robots.txt
Can you see what the HTTP status of your server's response is? It shuold be in the logs.