I installed a fresh Ubuntu 12.04 Server + Zend Server CE (MySQL / PHPmyadmin) from deb http://repos.zend.com/zend-server/5.6.0_ubuntu1204/deb server non-free Repository
.
My apache2/access.log looks like this and grooving every few seconds:
::1 - - [06/Aug/2012:13:27:59 +0200] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.2.22 (Ubuntu) (internal dummy connection)"
::1 - - [06/Aug/2012:13:27:59 +0200] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.2.22 (Ubuntu) (internal dummy connection)"
::1 - - [06/Aug/2012:13:27:59 +0200] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.2.22 (Ubuntu) (internal dummy connection)"
::1 - - [06/Aug/2012:13:28:00 +0200] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.2.22 (Ubuntu) (internal dummy connection)"
::1 - - [06/Aug/2012:13:28:00 +0200] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.2.22 (Ubuntu) (internal dummy connection)"
::1 - - [06/Aug/2012:13:28:00 +0200] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.2.22 (Ubuntu) (internal dummy connection)"
::1 - - [06/Aug/2012:13:28:00 +0200] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.2.22 (Ubuntu) (internal dummy connection)"
::1 - - [06/Aug/2012:13:28:00 +0200] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2.2.22 (Ubuntu) (internal dummy connection)"
223.255.255.1 - - [06/Aug/2012:13:28:08 +0200] "HEAD / HTTP/1.1" 200 276 "-" "-"
223.255.255.1 - - [06/Aug/2012:13:28:13 +0200] "HEAD / HTTP/1.1" 200 276 "-" "-"
223.255.255.1 - - [06/Aug/2012:13:28:18 +0200] "HEAD / HTTP/1.1" 200 276 "-" "-"
223.255.255.1 - - [06/Aug/2012:13:28:23 +0200] "HEAD / HTTP/1.1" 200 276 "-" "-"
223.255.255.1 - - [06/Aug/2012:13:28:28 +0200] "HEAD / HTTP/1.1" 200 276 "-" "-"
223.255.255.1 - - [06/Aug/2012:13:28:33 +0200] "HEAD / HTTP/1.1" 200 276 "-" "-"
223.255.255.1 - - [06/Aug/2012:13:28:38 +0200] "HEAD / HTTP/1.1" 200 276 "-" "-"
223.255.255.1 - - [06/Aug/2012:13:28:43 +0200] "HEAD / HTTP/1.1" 200 276 "-" "-"
223.255.255.1 - - [06/Aug/2012:13:28:48 +0200] "HEAD / HTTP/1.1" 200 276 "-" "-"
223.255.255.1 - - [06/Aug/2012:13:28:53 +0200] "HEAD / HTTP/1.1" 200 276 "-" "-"
223.255.255.1 - - [06/Aug/2012:13:28:58 +0200] "HEAD / HTTP/1.1" 200 276 "-" "-"
Do you know why and how to prevent it?