I have a debian server with plesk panel, this server is used for a wordpress mu installation with 10k blogs, from apache status I see a unexplained behavior, the same server send 5/10 GET continuous requests (5/10 every second) to root url of some blogs, this is example of access_log apache
lhost.serverhost.eu - - [30/Jul/2012:22:43:58 +0200] "GET / HTTP/1.0" 200 49152 "-" "WordPress/2.9.2; http: subdomainblog .maindomain. it"
I must restart apache for solve problem but after a few minutes the problem reappears I verified my crontab and this is not problem
nb: the requests are coming from himself