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Clearing the trusted hosts list with Set-WSManInstance

Sometimes you may just need to clear out all of the current values in the trusted hosts list and start again – especially in a lab environment where you may be experimenting.

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"
}

}

The trick is to use Set-WSManInstance to set the value of the TrustedHosts list to an empty string.  Don’t try and use $null  - it will fail

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