Software⏱️ 2 min read📅 2026-06-02

How to Fix: Invalid self signed SSL cert - "Subject Alternative Name Missing"

Fix Invalid self signed SSL cert - "Subject Alter. Add the Subject Alternative Name extensi. Step-by-step guide included.

Quick Answer: Add the Subject Alternative Name extension to your self-signed certificate.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🔧 Proven Troubleshooting Steps
  3. 🎯 Final Words

Chrome has started to flag self-signed SSL certificates as insecure, and in some cases, it may not work at all. This is because the browser requires a Subject Alternative Name (SAN) extension to specify the domain name or IP address for which the certificate is valid.

🔍 Why This Happens

  • [Cause]

🔧 Proven Troubleshooting Steps

Method 1: Adding a SAN Extension

  1. Step 1: Open your SSL certificate file in a text editor, such as Notepad or TextEdit.

Method 2: Using an Online Certificate Generator

  1. Step 1: Go to a reputable online certificate generator, such as DigiCert or GetPublicKey.

🎯 Final Words

By following these steps, you should be able to resolve the 'Invalid self signed SSL cert - Subject Alternative Name Missing' error in Chrome.

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