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

    Fault : "The trust relationship between this workstation and the primary domain failed"
    Fix   : Repair the secure channel without leaving the domain
    Source: https://jbtecwiz.com/support/win-sec-trust-relationship

    Run as     : Elevated PowerShell on the affected machine, signed in locally
    Expect     : 20 minutes
    Risk       : low
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    Always try this before the remove-and-rejoin that everyone reaches for.

    HOW TO UNDO IT
    None needed -- the account is back in a consistent state. Nothing was
    removed.

    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 '  "The trust relationship between this workstation and the primary domain failed"' -ForegroundColor White
Write-Host '  Repair the secure channel without leaving the domain' -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 'Sign in with a local administrator account. A cached domain account may work; a fresh one will not.' -Manual

Invoke-Step -Number 2 -Do 'Confirm the channel is actually broken.' -Command {
    Test-ComputerSecureChannel -Verbose
}

Invoke-Step -Number 3 -Do 'Repair it, supplying domain credentials with permission to reset the computer object.' -Why 'This resets the machine account password on both sides in place. Removing the machine from the domain and rejoining does the same thing but destroys the computer object''s group memberships, its BitLocker escrow and any Group Policy that targets it -- which is why it is the wrong first move.' -Command {
    Test-ComputerSecureChannel -Repair -Credential (Get-Credential DOMAIN\admin)
}

Invoke-Step -Number 4 -Do 'If that fails, reset the password with the netdom equivalent.' -Command {
    Reset-ComputerMachinePassword -Server DC01 -Credential (Get-Credential DOMAIN\admin)
}

Invoke-Step -Number 5 -Do 'Restart and sign in with a domain account.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'Test-ComputerSecureChannel returns True and domain sign-in works.' 'White'
Write-Host ''
if (-not $DryRun) {
    Test-ComputerSecureChannel
}

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/win-sec-trust-relationship' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: None needed -- the account is back in a consistent state. Nothing was removed.' 'DarkGray'
Write-Rule