PowerShell for Windows Admins

May 22 2014   10:40AM GMT

Adding to the trusted hosts list

Richard Siddaway Richard Siddaway Profile: Richard Siddaway

Its OK to be able to read the contents of the trusted hosts list but what about adding values to it?

function add-trustedhost {
param (
[string]$computername = $env:COMPUTERNAME

if (Test-Connection -ComputerName $computername -Quiet -Count 1) {
$th = Get-WSManInstance -ResourceURI winrm/config/client -ComputerName $computername |
select -ExpandProperty TrustedHosts

if ($th) {
$newth = $th + “, $trustedhost”
else {
$newth = $trustedhost

Set-WSManInstance -ResourceURI winrm/config/client -ComputerName $computername -ValueSet @{TrustedHosts = $newth}
else {
Write-Warning -Message “$computername is unreachable”


The function takes a computername paraneter and a string containing one or more machine names to add to the trusted host list.  This is a singe string so

“server02, servero3, server04”


“serevr02”, “server03”, “server04”

The current value in th trusted hosts list is retrieved and if it has  a current value the extra trusted host( s ) are added. If the trusted hosts list is empty the new list replaces it,  Set-WSManInstance is used to set the value.

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