Configuring ESXi hosts, vCenter Server systems, and the vSphere Web Client involves several tasks. Host ConfigurationBefore you create virtual machines on your hosts, you must configure the hosts to ensure that they have correct licensing, network and storage access, and security settings. Each type of host has a manual that provides information on the configuration for that host. Synchronizing Clocks on the vSphere NetworkBefore you install vCenter Single Sign-On, install the vSphere Web Client, or deploy the vCenter Server Appliance, make sure that all machines on the vSphere network have their clocks synchronized. Configuring vCenter Server in the vSphere Web ClientYou can configure vCenter Server from the vSphere Web Client, including settings such as licensing, statistics collection, logging, and other settings. Configuring the VMware vCenter Server ApplianceThe VMware vCenter Server Appliance is a preconfigured Linux-based virtual machine that is optimized for running vCenter Server and associated services. Configuring Communication Among ESXi , vCenter Server, and the vSphere Web ClientBy default, the vSphere Web Client uses ports 80 and 443 to communicate with vCenter Server and ESXi hosts.