Hi,
i found in nginx access log many entries like this every second.:
09/Feb/2015:17:01:46 +0100] "GET /component/k2/starterpaket HTTP/1.1" 499 0 "-" "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)"
But everytime the reference ip is the server itself. I think this issue came with the last update of k2, but i don´t know that can be the cause for this...
Some 3rd Party Extensions i´ve: Image Gallery Pro, dynamic 404, k2 canonical tags.
Thanks
Marco