“UNPROTECTED PRIVATE KEY FILE!” Error using SSH into Amazon EC2 Instance (AWS)

The problem is having wrong mod on the file.

Easily solved by executing –

chmod 400 mykey.pem

Taken from AWS instructions –

Your key file must not be publicly viewable for SSH to work. Use this
command if needed: chmod 400 mykey.pem

400 protects it by making it read only and only for the owner.

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