This blog is running Bad-Behaviour to try to limit spam and general naughtiness. It does it by header analysis on incoming requests, and it caches the results.

I noticed a couple of days ago that my Technorati pings were not updating on this site, and eventually narrowed it down to the fact that the Technorati Bot doesn’t send complete headers, so BB was blocking access to this valid source. Adding the technorati bot address to the whitelist file (as well as some other fiddling around that I’m not going to go into) means that the bot can now see the feed, and work with it correctly.

I hope this helps someone out there if they are having similar issues.