t is required that your private key files are NOT accessible by others. code example

Example 1: It is required that your private key files are NOT accessible by others. This private key will be ignored.

# if you are using WSL then include sudo before the commands
sudo ssh ...

Example 2: it is required that your private key files are not accessible by others

$ sudo chmod 600 /path/to/my/key.pem

Example 3: It is required that your private key files are NOT accessible by others ubuntu

chmod 400 {keyfile}.pem is what amazon instructed and it works.