⚠️ 3 verified solutions available for Error EMAIL-OUTLOOK-SSLCERTIFICATEERROR-015 — Last updated 2026-03-13
Error EMAIL-OUTLOOK-SSLCERTIFICATEERROR-015 📋

Fix Outlook Ssl Certificate Error (Error 15) — Windows Error Code EMAIL-OUTLOOK-SSLCERTIFICATEERROR-015

Error EMAIL-OUTLOOK-SSLCERTIFICATEERROR-015 (Outlook Ssl Certificate Error (Error 15)) is a Windows General System error that occurs when outlook: email ssl verification failed. check the correct ssl/tls port and certificate validity.. This guide provides step-by-step solutions to resolve this issue.

🏷️ Code: EMAIL-OUTLOOK-SSLCERTIFICATEERROR-015 📛 Outlook Ssl Certificate Error (Error 15) 📅 Updated: 2026-03-13 ⏱️ 3 Solutions

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⚡ Quick Fix

Update Root Certificates: Open Command Prompt as Administrator

👇 See all 3 solutions below

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📑 Table of Contents
What is Error EMAIL-OUTLOOK-SSLCERTIFICATEERROR-015? Common Causes Step-by-Step Solutions Prevention Tips Related Errors

💡 What is Error EMAIL-OUTLOOK-SSLCERTIFICATEERROR-015?

Windows System Error Code EMAIL-OUTLOOK-SSLCERTIFICATEERROR-015, known as Outlook Ssl Certificate Error (Error 15), is a General System error that occurs during core Windows operations. The error indicates that: Outlook: Email SSL verification failed. Check the correct SSL/TLS port and certificate validity. When this error is encountered, the Windows operating system was unable to complete the requested operation within the system services subsystem. The error code EMAIL-OUTLOOK-SSLCERTIFICATEERROR-015 is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name Outlook Ssl Certificate Error (Error 15) 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 date/time is incorrect, causing certificate validation to fail
  • Root certification authorities are outdated or missing
  • TLS protocol mismatch between client and server
  • Antivirus or proxy is intercepting SSL traffic with an untrusted certificate
📚 Comprehensive Guide

Resolving Cryptographic Provider and Certificate Chain Errors (CRYPT_E_BAD_MSG)

An encyclopedia on resolving failing SSL/TLS handshake errors, root certificate trust issues, and Windows Cryptographic Services failures.

Read the full guide →

✅ Step-by-Step Solutions

1 Update Root Certificates
  1. Open Command Prompt as Administrator
  2. Run: certutil -generateSSTFromWU roots.sst
  3. This downloads the latest root certificates from Microsoft
  4. Open certmgr.msc → Trusted Root Certification Authorities → import roots.sst
  5. Restart your browser and applications
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Show Advanced Solutions (2 more)
2 Fix System Date and Time
  1. Incorrect system time is the #1 cause of SSL/TLS errors
  2. Right-click the clock in the taskbar → Adjust date/time
  3. Enable 'Set time automatically' and 'Set time zone automatically'
  4. Click 'Sync now' under 'Synchronize your clock'
  5. If time is significantly off, manually set it first, then enable auto-sync
3 Clear SSL State and Cache
  1. Press Win+R, type inetcpl.cpl, press Enter
  2. Go to the Content tab → click 'Clear SSL State'
  3. Go to the Advanced tab → ensure TLS 1.2 and TLS 1.3 are checked
  4. Uncheck SSL 3.0 and TLS 1.0 (outdated and insecure)
  5. Click Apply → OK and restart your browser

🎬 Video Tutorials

▶️ Watch Video Tutorials
How To Fix Ssl Tls Certificate Error Windows
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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 "*EMAIL-OUTLOOK-SSLCERTIFICATEERROR-015*" -or $_.Message -like "*Outlook Ssl Certificate Error (Error 15)*"} | Format-List

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

🛡️ Prevention Tips

  • Keep your system clock synchronized (Settings → Time & Language → Sync now)
  • Install Windows Updates regularly to keep root certificates current
  • Disable SSL inspection in antivirus software if it causes certificate errors
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Last updated: 2026-03-13
📖
Based on Official Microsoft Documentation
Solutions Tested on Windows 10 & 11
Error codes sourced from Microsoft Win32 SDK. Updated 2026-03-13.
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