After installing moodle by using Fantastico or softaculous, its showing the following error.
Web server software (WebServerX) is not supported, sorry.
This is because the mod_security installed on the server and it can be resolved by editing the mod_security configuration file.
# vi /usr/local/apache/conf/modsec2.conf
and comment it, save the file and restart the apache service.
Moodle should be working fine now.