A list of preliminary troubleshooting steps before proceeding further.
1. Can you list out esxcfg-nics in the console of the disconnected host and find that the assigned nic is "UP"
2. Can you make sure that the Management network switch [vSwitch0 mostly] is having the vmnic which is having the uplink.
I have check the network conecetion it is fine connectet as Bridge .
Are you testing out ESX in a VM?