I keep getting the follow error in my Apache log:
[Wed Sep 18 17:59:20 2013] [notice] Apache/2.2.22 (Ubuntu) PHP/5.3.10-1ubuntu3.8 with Suhosin-Patch configured
I was having the same issue with Varnish>Apache>PHP-FPM on Centos 6.
I solved it by disabling KeepAlive in Apache.