#Requires -Version 5.1
<#
    JbTecWiz Support Centre -- generated fix script

    Fault : "No Remote Desktop license servers available"
    Fix   : Point the session host at the licence server and set the mode
    Source: https://jbtecwiz.com/support/srv-rds-licensing

    Run as     : Elevated PowerShell on the session host
    Expect     : 20 minutes
    Risk       : low
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    A licence server exists with CALs on it.

    HOW TO UNDO IT
    Clear the specified list and set the mode back to what it was.

    This script walks the fix one step at a time and asks before each
    one. Steps with no command are things you do yourself -- it prints
    those and waits. Run with -DryRun to print without executing.

    --------------------------------------------------------------------
    NO WARRANTY - USE AT YOUR OWN RISK

    This script is provided by JbTecWiz as-is and with no warranty of any
    kind, express or implied. You run it entirely at your own risk.

    JbTecWiz accepts no liability for any loss or damage arising from its
    use, including but not limited to data loss, downtime, or configuration
    changes that turn out to be wrong for your system.

    You are responsible for reading this script before running it, for
    satisfying yourself that it suits the machine in front of you, and for
    having a working backup first. Some steps cannot be undone.
    --------------------------------------------------------------------
#>

[CmdletBinding()]
param(
    # Print every step and command without running anything.
    [switch]$DryRun,
    # Do not ask before each step. Read the script first if you use this.
    [switch]$Unattended
)

$ErrorActionPreference = 'Stop'
$script:Failed = 0

function Write-Rule { param([string]$Text)
    Write-Host ''
    Write-Host ('-' * 70) -ForegroundColor DarkGray
    if ($Text) { Write-Host $Text -ForegroundColor Cyan }
}

function Show-Prose { param([string]$Text, [string]$Colour = "Gray")
    if (-not $Text) { return }
    $words = $Text -split "\s+"; $line = "  "
    foreach ($w in $words) {
        if (($line.Length + $w.Length) -gt 74) { Write-Host $line -ForegroundColor $Colour; $line = "  " }
        $line += "$w "
    }
    if ($line.Trim()) { Write-Host $line -ForegroundColor $Colour }
}

function Invoke-Step {
    param(
        [int]$Number, [string]$Do, [string]$Why,
        [scriptblock]$Command, [switch]$Manual, [string]$Shell = "powershell"
    )
    Write-Rule "  Step $Number of 5"
    Show-Prose $Do "White"
    if ($Why) { Write-Host ""; Show-Prose $Why "DarkGray" }

    if ($Manual) {
        Write-Host ''
        Write-Host '  -> Do this yourself, then press Enter to carry on.' -ForegroundColor Yellow
        if (-not $Unattended -and -not $DryRun) { [void](Read-Host) }
        return
    }

    Write-Host ''
    foreach ($l in ($Command.ToString().Trim() -split "`n")) {
        Write-Host ("    " + $l.Trim()) -ForegroundColor Green
    }
    Write-Host ''

    if ($DryRun) { Write-Host "  (dry run -- not executed)" -ForegroundColor DarkGray; return }
    if (-not $Unattended) {
        $a = Read-Host "  Run this step? [Y]es / [S]kip / [Q]uit"
        if ($a -match "^[Qq]") { Write-Host "  Stopped at your request."; exit 0 }
        if ($a -match "^[Ss]") { Write-Host "  Skipped." -ForegroundColor DarkGray; return }
    }
    try { & $Command }
    catch {
        $script:Failed++
        Write-Host ("  Step $Number failed: " + $_.Exception.Message) -ForegroundColor Red
        Show-Prose "The rest of the fix may depend on this. Read the write-up before carrying on." "Red"
        if (-not $Unattended) {
            $c = Read-Host "  Carry on anyway? [y/N]"
            if ($c -notmatch "^[Yy]") { exit 1 }
        }
    }
}

Write-Rule
Write-Host '  "No Remote Desktop license servers available"' -ForegroundColor White
Write-Host '  Point the session host at the licence server and set the mode' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: low   Reversible   20 minutes'
Write-Host ''
Show-Prose 'No warranty. Use at your own risk - JbTecWiz accepts no liability. Read it before you run it, and have a backup.' 'DarkYellow'
Write-Rule

if (-not $Unattended -and -not $DryRun) {
    $go = Read-Host '  Ready? [y/N]'
    if ($go -notmatch "^[Yy]") { Write-Host "  Nothing was changed."; exit 0 }
}

Invoke-Step -Number 1 -Do 'Check the current licensing configuration.' -Command {
    $ts = Get-WmiObject -Namespace root\cimv2\TerminalServices -Class Win32_TerminalServiceSetting
    $ts.LicensingName
    $ts.LicensingType
}

Invoke-Step -Number 2 -Do 'Set the licensing mode. 2 is Per Device, 4 is Per User -- it must match the CALs you actually own.' -Why 'A mismatch between the mode set here and the CAL type installed on the licence server produces this exact error even though everything looks configured.' -Command {
    $ts.ChangeMode(4)
}

Invoke-Step -Number 3 -Do 'Set the licence server name.' -Command {
    $col = Get-WmiObject -Namespace root\cimv2\TerminalServices -Class Win32_TSLicenseServer
    $col.SetSpecifiedLicenseServerList('rdlic.example.local')
}

Invoke-Step -Number 4 -Do 'Confirm the session host can reach and use it.' -Command {
    Test-NetConnection rdlic.example.local -Port 135
    $col.GetSpecifiedLicenseServerList()
}

Invoke-Step -Number 5 -Do 'Restart the Remote Desktop Services service or the server.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'The licensing diagnoser reports no problems -- run it from Server Manager -> Remote Desktop Services, or check the event log stops logging 1128.' 'White'
Write-Host ''
if (-not $DryRun) {
    Get-WinEvent -LogName 'Microsoft-Windows-TerminalServices-Licensing/Admin' -MaxEvents 10 | Format-Table TimeCreated, Id, Message -AutoSize
}

Write-Rule
if ($script:Failed -gt 0) {
    Write-Host ("  Finished with " + $script:Failed + " failed step(s).") -ForegroundColor Yellow
    Show-Prose 'Read the full write-up at https://jbtecwiz.com/support/srv-rds-licensing' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Clear the specified list and set the mode back to what it was.' 'DarkGray'
Write-Rule