Windows Event ID 4004 – WinLogon: Interactive Logon Process Initialization

Start by examining the complete event details to understand the context and timing of the WinLogon initialization.

1. Open Event Viewer by pressing Win + R, typing eventvwr.msc, and pressing Enter
2. Navigate to Windows Logs → System
3. Filter the log by clicking Filter Current Log in the Actions pane
4. Enter 4004 in the Event IDs field and click OK
5. Double-click the most recent Event ID 4004 to view detailed information
6. Check the General tab for the exact timestamp and any additional data
7. Review the Details tab for XML data that may contain process information

Use PowerShell to query multiple instances:

Get-WinEvent -FilterHashtable @{LogName='System'; Id=4004} -MaxEvents 20 | Format-Table TimeCreated, Id, LevelDisplayName, Message -AutoSize

Examine the relationship between WinLogon initialization and overall system startup performance to identify potential bottlenecks.

1. Use PowerShell to correlate Event ID 4004 with system startup events:

# Get recent boot events including WinLogon initialization
$BootEvents = Get-WinEvent -FilterHashtable @{LogName='System'; Id=@(6005,6006,6009,4004)} -MaxEvents 50
$BootEvents | Sort-Object TimeCreated | Format-Table TimeCreated, Id, LevelDisplayName, Message -AutoSize

2. Check Windows Boot Performance with built-in diagnostics:

# Analyze boot performance data
Get-WinEvent -FilterHashtable @{LogName='Microsoft-Windows-Diagnostics-Performance/Operational'; Id=100} -MaxEvents 5

3. Review startup programs that might delay WinLogon initialization:

# Check startup programs
Get-CimInstance Win32_StartupCommand | Select-Object Name, Command, Location, User

Verify that the WinLogon service and related authentication components are configured correctly for optimal performance.

1. Check WinLogon service status and configuration:

# Verify critical logon services
$Services = @('Winlogon', 'LSASS', 'SamSs', 'LanmanServer', 'LanmanWorkstation')
foreach ($Service in $Services) {
    Get-Service -Name $Service -ErrorAction SilentlyContinue | Select-Object Name, Status, StartType
}

2. Examine WinLogon registry configuration:

# Check WinLogon registry settings
Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" | Select-Object Shell, Userinit, VMApplet

3. Verify authentication package configuration:

# Check loaded authentication packages
Get-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Lsa" -Name "Authentication Packages"

4. Review Group Policy settings affecting logon:

# Check relevant Group Policy settings
Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" | Select-Object DisableCAD, DontDisplayLastUserName, LegalNoticeCaption

Implement comprehensive monitoring of the authentication subsystem to proactively identify issues that might affect WinLogon initialization.

1. Create a PowerShell script to monitor authentication events:

# Monitor authentication subsystem events
$AuthEvents = @(4004, 4005, 4634, 4624, 4625)
$Events = Get-WinEvent -FilterHashtable @{LogName=@('System','Security'); Id=$AuthEvents; StartTime=(Get-Date).AddHours(-24)}
$Events | Group-Object Id | Select-Object Name, Count | Sort-Object Name

2. Set up performance counter monitoring for logon performance:

# Monitor logon performance counters
$Counters = @(
    '\LogicalDisk(C:)\Avg. Disk Queue Length',
    '\Memory\Available MBytes',
    '\Processor(_Total)\% Processor Time'
)
Get-Counter -Counter $Counters -SampleInterval 5 -MaxSamples 12

3. Check for authentication-related errors in the Application log:

# Look for authentication errors
Get-WinEvent -FilterHashtable @{LogName='Application'; Level=2; StartTime=(Get-Date).AddDays(-7)} | Where-Object {$_.ProviderName -like '*Auth*' -or $_.Message -like '*logon*'} | Select-Object TimeCreated, Id, ProviderName, LevelDisplayName

4. Verify domain connectivity for domain-joined systems:

# Test domain controller connectivity
Test-ComputerSecureChannel -Verbose
nltest /dsgetdc:$env:USERDOMAIN

Use advanced diagnostic tools to perform deep analysis of WinLogon initialization when standard methods don't reveal the root cause of issues.

1. Enable detailed WinLogon logging through registry modification:

# Enable verbose WinLogon logging (requires restart)
Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" -Name "EnableVerboseStatus" -Value 1 -Type DWord
Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" -Name "VerboseStatus" -Value 1 -Type DWord

2. Use Windows Performance Toolkit for boot trace analysis:

# Start boot trace (run as administrator)
wpr -start GeneralProfile -start CPU -start DiskIO
# After reboot, stop the trace
wpr -stop C:\BootTrace.etl

3. Configure Event Tracing for Windows (ETW) for detailed authentication monitoring:

# Create ETW session for authentication events
$SessionName = "AuthTrace"
logman create trace $SessionName -p "Microsoft-Windows-Winlogon" 0xFFFFFFFF 0xFF -o C:\AuthTrace.etl -ets
# Stop the trace after collecting data
logman stop $SessionName -ets

4. Analyze system file integrity that might affect WinLogon:

# Check system file integrity
sfc /scannow
Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /ScanHealth

5. Review Windows Security log for detailed authentication flow:

# Analyze security events around WinLogon initialization
$SecurityEvents = Get-WinEvent -FilterHashtable @{LogName='Security'; Id=@(4608,4609,4610,4611); StartTime=(Get-Date).AddDays(-1)}
$SecurityEvents | Format-Table TimeCreated, Id, Message -AutoSize