I just registered to post about this, but luckily I found this thread before opening a new one. I got four such requests on my WordPress site yesterday (in an interval of 4 seconds), but nothing bad seemed to have happened. I had 2.5.1 installed, but I only noticed those requests after I had finished upgrading to 2.6.1.
Still a bit discouraging, almost makes me want to go back to either a static website, or a super-simple self made solution with flat files, without any comment support of course, as that’s a whole new can of worms…
Agch.
