Google Webmaster's tool tells me on a site that "Request timed out or site is blocking Google". On that site. I am wondering how to fix this.
Probably relevant info: I'm using Varnish in front of nginx and also user use iptables and DDoS deflate. The site is large but works pretty smoothly, with load less than 2 most of the times. The standard Pressflow 6 robots.txt is there and accessible through browser.
I am not quite sure how to figure out what blocks googlebots and how to fix the problem. So appreciate your hints.