Powershell: Change IIS Application Pool passwords via WMI

Question

BACKGROUND: I'm writing a script to pull all PCs in an OU, Search each server for IIS Application Pools running under a spesified user, change the password on the app pool, reset IIS.
I'm able to grab the application pools on a server...
$tmp = $NULL
$tmp = Get-WMIObject -class IISApplicationPoolSetting -namespace "root\microsoftiisv2" -computer $Server -authentication 6
I can find the app pool(s) I need...
$PoolsThatMatch = @()
if ($tmp) { $PoolsThatMatch += $tmp | where {$_.WAMUserName -like "contoso\$ServiceName"}}
I can see all the information rigth there...
$PoolsThatMatch | Select __Server,name,WAMUserName,WAMUserPass
I can even change the password on the local object...
$PoolsThatMatch[0].Properties["WAMUserPass"].Value = "PowerShellRocks!"
What I can't figure out is how to push the value back to the server! Please help!

Answer 1

Hi.
First, msdn points out the following caution which should be considered before changing the password.
Changing the value of this property is not recommended. If you do, you must change the Windows account password to the identical value. You must also synchronize existing IIS out-of-process application identities, using Component Services to edit the user name and password values, which are found on the Identity tab of the property sheet for each package.
http://msdn.microsoft.com/en-us/library/ms525467.aspx
Secondly, using the Put() method should set the changes made:
$PoolsThatMatch[0].PsObject.Properties["WAMUserPass"].Value = "Password2"
$PoolsThatMatch[0].Put()
Regards
NiklasNiklas Goude
Blog: www.powershell.nu
Twitter: @Ngoude