Clear the trusted host list

The final option in administering the trusted host list is to clear the entire list. The following function will clear the trusted host list

function clear-trustedhost {
[CmdletBinding()]
param (
  [string]$computername = $env:COMPUTERNAME
)

if (Test-Connection -ComputerName $computername -Quiet -Count 1) {
   Set-WSManInstance -ResourceURI winrm/config/client -ComputerName $computername -ValueSet @{TrustedHosts = “”}
}
else {
   Write-Warning -Message “$computername is unreachable”
}

}

Use Set-WSMANinstance to set the value of trusted hosts to being an empty string.