If you discover ESX hosts through a vCenter Server, all subsequent communications with these VM hosts take place through the vCenter Server.
You can reset this access mechanism to Direct to ESX or back to Via vCenter:
Refresh the required ESX host.
See Refreshing Source Workload Details.
The system prompts you to select an access type:
Select the required option, then click Refresh.
PlateSpin Migrate rediscovers the required ESX host by using the specified access mechanism, which it uses for all subsequent communications with that host.