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

    Fault : 802.1X or VPN authentication fails at NPS -- reason codes 16, 23, 48 and 265
    Fix   : Get a policy to match
    Source: https://jbtecwiz.com/support/srv-app-nps-radius

    Run as     : Elevated PowerShell
    Expect     : 35 minutes
    Risk       : medium
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    Reason code 48.

    HOW TO UNDO IT
    Policy order and membership changes are reversible in the NPS console.

    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 6"
    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 '  802.1X or VPN authentication fails at NPS -- reason codes 16, 23, 48 and 265' -ForegroundColor White
Write-Host '  Get a policy to match' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: medium   Reversible   35 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 'Read the event -- it lists the conditions that were evaluated.' -Command {
    Get-WinEvent -LogName Security -MaxEvents 50 | Where-Object Id -eq 6273 | Select-Object -First 2 | Format-List Message
}

Invoke-Step -Number 2 -Do 'List the policies and their order. They are evaluated top to bottom and the first match wins.' -Why 'A disabled policy or one below a broader deny rule is the usual cause. The order matters as much as the contents, and the console makes it easy to add a correct policy in the wrong position.' -Command {
    Get-NpsNetworkPolicy | Format-Table PolicyName,Enabled,ProcessingOrder,PolicySource -AutoSize
}

Invoke-Step -Number 3 -Do 'Check the connection request policy too -- that is evaluated first and can reject before the network policy is reached.' -Command {
    Get-NpsRadiusClient | Format-Table Name,Address,Enabled
}

Invoke-Step -Number 4 -Do 'Check the RADIUS client is registered with the right shared secret -- an unregistered access point is silently ignored.' -Manual

Invoke-Step -Number 5 -Do 'Verify the user or computer is in the group the policy requires.' -Command {
    Get-ADUser jbloggs -Properties MemberOf | Select-Object -ExpandProperty MemberOf
}

Invoke-Step -Number 6 -Do 'Enable NPS accounting to a text file so failures are easier to read than in the Security log.' -Command {
    Get-NpsRadiusClient | Format-List
}

Write-Rule "  Confirm it worked"
Show-Prose 'The connection matches the intended policy, named in event 6272.' 'White'

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-app-nps-radius' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Policy order and membership changes are reversible in the NPS console.' 'DarkGray'
Write-Rule