Knowledge in both linux and windows platform.Excellent knowledge in hosting control panels such as cPanel, Plesk, ISPConfig and DirectAdmin.Excellent knowledge in virtualization technologies such as virtuozzo, vmWare and Xen.Ability to configure all types of firewalls such as csf, apf and of course iptables.Can configure any kind of third party CMS applications.Ability to configure custom servers (non-control panel too) such as php+nginx apache+mysql+php.Ability to configure any kind of mail servers, including exchange servers.Excellent trouble shooting skills.