Hi Rob,

Executing JoinDomain_task in PowerCLI 4.1 is a little bit tricky since some of the new vSphere 4.1 host managers are missing in VMware.Vim assembly. However you can workaround the problem with this simple script:

function GetHostADAuthManagerMoRef($vmHost) {
     $filter = New-Object VMware.Vim.PropertyFilterSpec
     $filter.ObjectSet += New-Object VMware.Vim.ObjectSpec
     $filter.ObjectSet[0].Obj = $vmHost.ConfigManager.AuthenticationManager
     $filter.PropSet += New-Object VMware.Vim.PropertySpec
     $filter.PropSet[0].Type = "HostAuthenticationManager"
     $filter.PropSet[0].All = $true
     
     $collector = Get-View $vmHost.Client.ServiceContent.PropertyCollector 
     $content = $collector.RetrieveProperties($filter)
     $supportedStore = $content[0].PropSet | ? {$_.Name -eq "supportedStore"} 
     $result = $supportedStore.Val | ? {$_.Type -eq "HostActiveDirectoryAuthentication"}
     
     return [http://VMware.Vim.VIConvert|http://VMware.Vim.VIConvert]::ToVim41($result)
}

Connect-VIServer 'MyVC' -User 'Username' -Pass 'Password'
$vmHost = Get-View (Get-VMHost 'MyHost')
$authManagerMoRef = GetHostADAuthManagerMoRef($vmHost)

$taskMoRef = $vmHost.Client.VimService.JoinDomain_Task($authManagerMoRef, 'DomainToJoin', 'DomainUsername', 'Password')
$vmHost.WaitForTask([http://VMware.Vim.VIConvert|http://VMware.Vim.VIConvert]::ToVim($taskMoRef))

Regards,

Yasen Kalchev

PowerCLI Dev Team