TCP and UDP Ports for vCenter Server, ESX hosts, and other network components management access

These services and agents are commonly present in a vSphere environment:

    * CIM HTTP server (insecure service)
    * CIM HTTPS server
    * FTP client (insecure service)
    * FTP server (insecure service)
    * iSCSI software client
    * NFS client (insecure service)
    * NFS server (insecure service)
    * NIS client
    * NTP client
    * SMB client (insecure service)
    * SNMP server
    * SSH client
    * SSH server
    * Syslog client
    * Telnet client (insecure service)
    * Telnet server (insecure service)
    * Other supported management agents that you install

vCenter Server, ESX hosts, and other network components are accessed using predetermined TCP and UDP ports. If you manage network components from outside a firewall, you may be required to reconfigure the firewall to allow access on the appropriate ports.