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

    Fault : Event 5719 -- no domain controller available for the domain
    Fix   : Make the machine wait for the network before logging on
    Source: https://jbtecwiz.com/support/srv-netlogon-5719

    Run as     : Elevated PowerShell
    Expect     : 20 minutes
    Risk       : low
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    Only at startup, with no impact afterwards. This is a race, not a fault.

    HOW TO UNDO IT
    Set SyncForegroundPolicy back to 0.

    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 4"
    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 '  Event 5719 -- no domain controller available for the domain' -ForegroundColor White
Write-Host '  Make the machine wait for the network before logging on' -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 'Confirm the event only ever appears within a minute of boot.' -Why 'Event 6005 is the event log starting, which is as close to boot time as you get. If every 5719 lands within a minute of a 6005, it is the race.' -Command {
    Get-WinEvent -FilterHashtable @{LogName='System'; Id=5719} -MaxEvents 20 | Format-Table TimeCreated, Message -AutoSize
    Get-WinEvent -FilterHashtable @{LogName='System'; Id=6005} -MaxEvents 5 | Format-Table TimeCreated
}

Invoke-Step -Number 2 -Do 'Turn on Always wait for the network at computer startup and logon in Group Policy, under Computer Configuration -> Administrative Templates -> System -> Logon.' -Why 'It costs a few seconds of boot time and removes a whole class of intermittent policy and drive-mapping failures.' -Command {
    New-Item -Path 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon' -Name 'SyncForegroundPolicy' -Force -ErrorAction SilentlyContinue
    Set-ItemProperty 'HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\CurrentVersion\Winlogon' -Name SyncForegroundPolicy -Value 1 -Type DWord
}

Invoke-Step -Number 3 -Do 'Disable NIC power saving, which delays link-up on wake.' -Command {
    Get-NetAdapter | ForEach-Object { Set-NetAdapterPowerManagement -Name $_.Name -AllowComputerToTurnOffDevice Disabled -ErrorAction SilentlyContinue }
}

Invoke-Step -Number 4 -Do 'On a Wi-Fi machine, enable the machine-account authentication option so the network is up before sign-in.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose '5719 stops appearing on subsequent restarts.' '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-netlogon-5719' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Set SyncForegroundPolicy back to 0.' 'DarkGray'
Write-Rule