Every administrator around the world may have problems with the network connection and the first action to begin the troubleshooting process is the use of the command ping. Yes, an easy ping can help you but you have to ping from all directions: ESXi to vCSA and vCSA to ESXi. A typical possible TRBL scenario is when the network configuration is bad, VLAN is bad, NIC Teaming is not configured correctly, a port on a switch can be down, or there is a hardware problem with a vmnic or with a physical switch.
The following CLIs can help you to identify the problem:
esxcfg-vswitchesxcfg-vmknicesxcli network esxcfg-nics
When you need a real change in the management network, you can repair it through DCUI.
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