Private/AddWinRMTrustLocalHost.ps1

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function AddWinRMTrustLocalHost {
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory=$False)]
        [string]$NewRemoteHost = "localhost"
    )

    # Make sure WinRM in Enabled and Running on $env:ComputerName
    try {
        $null = Enable-PSRemoting -Force -ErrorAction Stop
    }
    catch {
        if ($PSVersionTable.PSEdition -eq "Core") {
            Import-WinModule NetConnection
        }

        $NICsWPublicProfile = @(Get-NetConnectionProfile | Where-Object {$_.NetworkCategory -eq 0})
        if ($NICsWPublicProfile.Count -gt 0) {
            foreach ($Nic in $NICsWPublicProfile) {
                Set-NetConnectionProfile -InterfaceIndex $Nic.InterfaceIndex -NetworkCategory 'Private'
            }
        }

        try {
            $null = Enable-PSRemoting -Force
        }
        catch {
            Write-Error $_
            Write-Error "Problem with Enable-PSRemoting WinRM Quick Config! Halting!"
            $global:FunctionResult = "1"
            return
        }
    }

    # If $env:ComputerName is not part of a Domain, we need to add this registry entry to make sure WinRM works as expected
    if (!$(Get-CimInstance Win32_Computersystem).PartOfDomain) {
        $null = reg add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v LocalAccountTokenFilterPolicy /t REG_DWORD /d 1 /f
    }

    # Add the New Server's IP Addresses to $env:ComputerName's TrustedHosts
    $CurrentTrustedHosts = $(Get-Item WSMan:\localhost\Client\TrustedHosts).Value
    [System.Collections.ArrayList][array]$CurrentTrustedHostsAsArray = $CurrentTrustedHosts -split ','

    $HostsToAddToWSMANTrustedHosts = @($NewRemoteHost)
    foreach ($HostItem in $HostsToAddToWSMANTrustedHosts) {
        if ($CurrentTrustedHostsAsArray -notcontains $HostItem) {
            $null = $CurrentTrustedHostsAsArray.Add($HostItem)
        }
        else {
            Write-Warning "Current WinRM Trusted Hosts Config already includes $HostItem"
            return
        }
    }
    $UpdatedTrustedHostsString = $($CurrentTrustedHostsAsArray | Where-Object {![string]::IsNullOrWhiteSpace($_)}) -join ','
    Set-Item WSMan:\localhost\Client\TrustedHosts $UpdatedTrustedHostsString -Force
}