How to fix Error 1334 on Windows 11

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Troubleshooting Guide: Error 1334 – No More Local User Identifiers (LUIDs) Available

Why This Error Happens

This error occurs when the Windows kernel’s pool of Locally Unique Identifiers (LUIDs) becomes exhausted, which typically happens after extremely long system uptime or a memory leak in a process that repeatedly creates logon sessions without properly closing them. Each authentication event, service logon, or scheduled task consumes a LUID, and since these are a finite 32-bit resource per boot cycle, a runaway process or corrupted authentication component can deplete them faster than normal. This is commonly triggered by faulty third-party security software, misconfigured scheduled tasks, or a system that has not been rebooted in months.

Step-by-Step Resolution Guide

Step 1: Restart the System Immediately

  • LUIDs are a per-boot resource, so a full restart resets the counter and immediately resolves the symptom.
  • Go to Start > Power > Restart (avoid Shut Down, as Fast Startup on Windows 11 may not fully clear the kernel state).
  • Note the uptime before restarting via net statistics workstation in Command Prompt to confirm the machine had been running for an extended period.

Step 2: Identify the Process Leaking LUIDs

  • Open Task Manager (Ctrl+Shift+Esc) and check for processes with unusually high handle counts under the “Details” tab (right-click column headers to add “Handles”).
  • Use Get-Process | Sort-Object Handles -Descending | Select-Object -First 10 in PowerShell to pinpoint the top offenders.
  • Cross-reference the process name against recently installed antivirus, VPN, or RDP-related software known to cause session leaks.

Step 3: Update or Remove the Problematic Software

  • Check Windows Update (Settings > Windows Update) and the vendor’s website for a patched version of the identified application.
  • If no patch exists, uninstall the software via Settings > Apps > Installed Apps and monitor handle counts over the next 24–48 hours.
  • Disable any suspicious scheduled tasks in Task Scheduler that run at very short intervals (e.g., every few seconds), as these can rapidly consume LUIDs.

Step 4: Apply Windows Updates and Check Event Viewer

  • Navigate to Settings > Windows Update > Check for updates and install all pending cumulative updates, as Microsoft has patched LUID exhaustion bugs in past builds.
  • Open Event Viewer (eventvwr.msc) and review the Windows Logs > System branch, filtering for Event ID 1334 to confirm the timestamp correlates with the offending process activity.

Alternative or Verification Steps

  • After restarting, monitor the system for 48–72 hours and re-check Event Viewer for recurrence of Event ID 1334 under Windows Logs > System.
  • If the issue returns quickly, run sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth in an elevated Command Prompt to rule out corrupted system files as a contributing cause.