I have Installed Zend guard loader on my CentOS 6 VPS but when going to my site its showing "Zend Guard Run-time support missing!". when I run this # php -i | grep Zend I got Zend Extension => 220090626 Zend Extension Build => API220090626,NTS Zend Memory Manager => enabled Zend Multibyte Support => disabled This program makes use of the Zend Scripting Language Engine: Zend Engine v2.3.0, Copyright (c) 1998-2013 Zend Technologies with Zend Guard Loader v3.3, Copyright (c) 1998-2010, by Zend Technologies PHP Warning: Unknown: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EDT/-4.0/DST' instead in Unknown on line 0 Zend Guard Loader Zend Guard Loader => enabled Code (markup): Also I checked SELinux is disabled, I installed same version OS and loader. Can anyone suggest me What wrong I did?