system:
Linux web 2.6.27.21-0.1-pae #1 SMP 2009-03-31 14:50:44 +0200 i686 i686 i386 GNU/Linux PHP Version 5.3.8 Apache Version Apache/2.2.21 (Linux/SUSE)
In CentOS 6.5 I changed the value of the file: /etc/sysconfig/network
/etc/sysconfig/network
Original value:
HOSTNAME=localhost.localdomain
New value:
HOSTNAME=127.0.0.1