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The management port on an ESXi host is not responding. You need to use the ESXi Shell directly from the console of the host to troubleshoot. You suspect the problem is that the speed and duplex of the network adapter is incorrect or that the associated VLAN is incorrect.
VDCA510 Objective: 6.3 Troubleshoot Network Performance and Connectivity
VDCA550 Objective: 2.3 Troubleshoot Virtual Switch Solutions
esxcli network vswitch standard list
esxcli network vswitch standard portgroup list
esxcli network nic list
esxcli network vswitch standard portgroup set -p 'Management Network' -v 100
NOTE: in your lab environment, these steps may actually disrupt your connection to the Management Network because your network is not configured to support VLAN 100 on the connections to vmnic0 and vmnic1. If this is true, use similar commands to change the VLAN back to zero.