Windows Event ID 1016 – WinLogon: Group Policy Application Failed

Start by examining the complete event details and related Group Policy events to identify the specific failure cause.

1. Open Event Viewer by pressing Win + R, typing eventvwr.msc, and pressing Enter
2. Navigate to Windows Logs → System
3. Filter for Event ID 1016 using the Filter Current Log option
4. Double-click the most recent Event ID 1016 to view detailed information
5. Note the error code and description in the event details
6. Check Applications and Services Logs → Microsoft → Windows → GroupPolicy → Operational for additional context
7. Use PowerShell to gather recent Group Policy events:

   Get-WinEvent -FilterHashtable @{LogName='Microsoft-Windows-GroupPolicy/Operational'; StartTime=(Get-Date).AddHours(-24)} | Where-Object {$_.LevelDisplayName -eq 'Error' -or $_.LevelDisplayName -eq 'Warning'} | Format-Table TimeCreated, Id, LevelDisplayName, Message -Wrap

Verify that the affected machine can properly communicate with domain controllers and resolve DNS names.

1. Open an elevated Command Prompt or PowerShell session
2. Test domain controller connectivity:

   nltest /dsgetdc:yourdomain.com

3. Verify DNS resolution for domain controllers:

   nslookup -type=SRV _ldap._tcp.dc._msdcs.yourdomain.com

4. Test LDAP connectivity to domain controllers:

   Test-NetConnection -ComputerName dc01.yourdomain.com -Port 389

5. Check time synchronization with domain controllers:

   w32tm /query /status

6. If time is out of sync, synchronize with domain:

   w32tm /resync /force

7. Test Group Policy processing manually:

   gpupdate /force

Ensure the computer account is properly authenticated with the domain and trust relationships are intact.

1. Check the computer's domain membership status:

   Test-ComputerSecureChannel -Verbose

2. If the secure channel test fails, repair the computer account:

   Test-ComputerSecureChannel -Repair -Credential (Get-Credential)

3. Verify the computer account exists in Active Directory:

   Get-ADComputer -Identity $env:COMPUTERNAME -Properties PasswordLastSet, Enabled

4. Check for computer account lockout or expiration:

   Get-ADComputer -Identity $env:COMPUTERNAME -Properties AccountLockoutTime, AccountExpirationDate

5. Reset the computer account password if necessary:

   Reset-ComputerMachinePassword -Credential (Get-Credential)

6. Restart the affected computer after password reset
7. Verify Group Policy processing after restart:

   gpresult /r

Verify that the computer can access SYSVOL shares and that Group Policy files are not corrupted.

1. Test access to the SYSVOL share:

   Test-Path "\\yourdomain.com\SYSVOL\yourdomain.com\Policies"

2. List Group Policy folders in SYSVOL:

   Get-ChildItem "\\yourdomain.com\SYSVOL\yourdomain.com\Policies" | Where-Object {$_.Name -match '^{[A-F0-9-]+}$'}

3. Check permissions on SYSVOL share:

   icacls "\\yourdomain.com\SYSVOL\yourdomain.com\Policies"

4. Verify Group Policy template files exist:

   Get-ChildItem "\\yourdomain.com\SYSVOL\yourdomain.com\Policies\*\gpt.ini" -Recurse

5. Check for corrupted registry.pol files:

   Get-ChildItem "\\yourdomain.com\SYSVOL\yourdomain.com\Policies\*\Machine\registry.pol" -Recurse | ForEach-Object { try { [System.IO.File]::ReadAllBytes($_.FullName) | Out-Null; Write-Host "$($_.FullName) - OK" -ForegroundColor Green } catch { Write-Host "$($_.FullName) - CORRUPTED" -ForegroundColor Red } }

6. Clear local Group Policy cache if corruption is found:

   Remove-Item "C:\Windows\System32\GroupPolicy\*" -Recurse -Force

Configure detailed Group Policy logging to capture comprehensive diagnostic information for complex issues.

1. Enable Group Policy operational logging:

   wevtutil sl Microsoft-Windows-GroupPolicy/Operational /e:true

2. Configure verbose Group Policy logging in the registry:

   New-ItemProperty -Path "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" -Name "GPExtensions" -Value 1 -PropertyType DWord -Force

3. Enable Group Policy debug logging:

   New-ItemProperty -Path "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Diagnostics" -Name "GPSvcDebugLevel" -Value 0x30002 -PropertyType DWord -Force

4. Set Group Policy processing to synchronous mode for testing:

   New-ItemProperty -Path "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" -Name "SynchronousUserGroupPolicy" -Value 1 -PropertyType DWord -Force

5. Restart the Group Policy Client service:

   Restart-Service gpsvc -Force

6. Force Group Policy refresh and monitor logs:

   gpupdate /force /wait:0

7. Analyze detailed logs in Event Viewer under Applications and Services Logs → Microsoft → Windows → GroupPolicy
8. Generate comprehensive Group Policy report:

   gpresult /h C:\GPReport.html /f