winrm set winrm/config/client @{TrustedHosts="server1,server2,server3,server4"}
winrm set winrm/config/client @{TrustedHosts=""}
winrm get winrm/config -format:pretty

winrm set winrm/config/client @{TrustedHosts="dc01-tr,dc01-tr.travisrunyard.me"}