Software⏱️ 2 min read📅 2026-05-31

How to Fix: "UNPROTECTED PRIVATE KEY FILE!" Error using SSH into Amazon EC2 Instance (AWS)

SSH into Amazon EC2 Instance Error

Quick Answer: Change the permissions of your .pem file to 0600 (read and write for owner only) to resolve the UNPROTECTED PRIVATE KEY FILE! error.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🚀 How to Resolve This Issue
  3. 💡 Conclusion

The "UNPROTECTED PRIVATE KEY FILE!" error occurs when the SSH private key file is not properly secured, allowing others to access it. This can happen due to incorrect permissions or a lack of encryption.

🛑 Root Causes of the Error

  • Incorrect permissions on the private key file.
  • Lack of encryption on the private key file.

🚀 How to Resolve This Issue

Method 1: Secure Permissions

  1. Step 1: Use the `chmod` command to change the permissions of the private key file to `0600`, which restricts access to the owner only.

Method 2: Encrypt the Private Key File

  1. Step 1: Use a tool like `ssh-keygen` to generate a new private key file with encryption.

💡 Conclusion

By securing the permissions and/or encrypting the private key file, you can resolve the "UNPROTECTED PRIVATE KEY FILE!" error and ensure secure SSH access to your Amazon EC2 instance.

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