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Just wanted to share something I learned concerning the robots.txt file. I always took this file for granted and most of my sites don't even have one. Unfortunately, recently I built a website with several subdomains all running under one program. Due to a bug in the program, the website was returning an error page instead of a 404 File Not Found when queried for a missing file. Google always queries the robots.txt file before going any further in the website and it was getting the text of the error page instead of a File Not Found. Apparently, Google didn't like that and did not bother to crawl any further.
So be careful and make sure your robots.txt file is functioning properly.