⚠️ 3 verified solutions available for Error HTTP-401 — Last updated 2026-03-16
Error HTTP-401 📋

Fix HTTP_UNAUTHORIZED — Windows Error Code HTTP-401

Error HTTP-401 (HTTP_UNAUTHORIZED) is a Windows General System error that occurs when http 401 unauthorized: authentication is required and has failed or has not yet been provided.. This guide provides step-by-step solutions to resolve this issue.

🏷️ Code: HTTP-401 📛 HTTP_UNAUTHORIZED 📅 Updated: 2026-03-16 ⏱️ 3 Solutions
⚡ Quick Fix

Restart the Affected Service: Press Win+R, type services.msc, and press Enter

👇 See all 3 solutions below
🐞 Auto-Fix Script for Error HTTP-401
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📑 Table of Contents
What is Error HTTP-401? Common Causes Step-by-Step Solutions Prevention Tips Related Errors

💡 What is Error HTTP-401?

Windows System Error Code HTTP-401, known as HTTP_UNAUTHORIZED, is a General System error that occurs during core Windows operations. The error indicates that: HTTP 401 UNAUTHORIZED: Authentication is required and has failed or has not yet been provided. When this error is encountered, the Windows operating system was unable to complete the requested operation within the system services subsystem. The error code HTTP-401 is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name HTTP_UNAUTHORIZED maps directly to this numeric code and is commonly referenced in Microsoft documentation, developer forums, and system logs. Understanding this error and its context within core Windows operations is essential for effective troubleshooting.

⚠️ Common Causes

  • System resource conflict: HTTP 401 UNAUTHORIZED: Authentication is required and has failed or has not yet been provided.
  • A system service has stopped or is unresponsive
  • System files are corrupted or missing
  • Insufficient system resources (memory, handles, threads)
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✅ Step-by-Step Solutions

1 Restart the Affected Service
  1. Press Win+R, type services.msc, and press Enter
  2. Look for any service showing 'Stopped' that should be running
  3. Right-click it → Properties → set Startup Type to Automatic
  4. Click Start, then click Apply → OK
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2 Run System File Checker and DISM
  1. Open Command Prompt as Administrator
  2. Run: DISM /Online /Cleanup-Image /RestoreHealth (wait 10-20 min)
  3. Then run: sfc /scannow
  4. Restart your computer if any files were repaired
3 Check Windows Event Viewer for Details
  1. Press Win+R, type eventvwr.msc, press Enter
  2. Navigate to Windows Logs → System
  3. Look for Error or Warning entries around the time of your issue
  4. Double-click the entry to see the detailed error message and source
  5. Google the Event ID for specific troubleshooting steps

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💻 Diagnostic Command

Run this PowerShell command to find related events in your system log:

Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*HTTP-401*" -or $_.Message -like "*HTTP_UNAUTHORIZED*"} | Format-List

💡 Open PowerShell as Administrator, paste the command above, and press Enter.

🛡️ Prevention Tips

  • Keep Windows and drivers up to date
  • Run sfc /scannow and DISM periodically
  • Monitor Event Viewer for early warnings
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Last updated: 2026-03-16
📖
Based on Official Microsoft Documentation
Solutions Tested on Windows 10 & 11
Error codes sourced from Microsoft Win32 SDK. Updated 2026-03-16.
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