Solve - Warning Unprotected Private Key File AWS EC2 Error

Solve Unprotected Private Key File AWS Error #

The reason the "Warning: Unprotected Private Key File" AWS error occurs is because we're trying to SSH into an EC2 instance using a private key that allows read access to other users.

A private key must only be readable by your user on the machine in order to allow you to SSH into an EC2 instance.

In order to solve the "Warning: Unprotected Private Key File" error in AWS EC2, update the permissions of the private key file to only allow read access from the current user.

Open your terminal in the directory where your private key is located and run the chmod command.

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chmod 600 ec2-private-key.pem

Try to ssh into the EC2 instance again, for amazon linux instances the command looks like:

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ssh -i "ec2-private-key.pem" ec2-user@YOUR_EC2_PUBLIC_DNS

If you are still getting the error try changing the permissions of the directory that contains the private key. For example if you store your keys in a directory called ec2, you would do:

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chmod 755 ./ec2

Lastly, make sure you're using the correct ssh command, the username varies between the different amazon machine images (e.g. ubuntu or ec2-user).

To get the correct ssh command for your EC2 instance:

1. In the EC2 console, click on the checkbox next to your instance's name
2. Click on Actions and select Connect
3. Click on the SSH client Tab and copy the example ssh command

Further Reading #

• AWS CDK Tutorial for Beginners - Step-by-Step Guide
• How does AWS CDK work
• What is a Token in AWS CDK
• CDK Constructs - Complete Guide
• What is an identifier (id) in AWS CDK
• How to use Context in AWS CDK
• How to use Parameters in AWS CDK