When I download the .pem file to ssh my AWS instance, I encountered the following error:
WARNING: UNPROTECTED PRIVATE KEY FILE!
Permissions 0640 for ‘blog.pem’ are too open. It is required that your private key files are NOT accessible by others. This private key will be ignored. bad permissions: ignore key: blog.pem Permission denied (publickey).
Run this command in your terminal
ssh -i xxx.pem firstname.lastname@example.org
Replace xxx.pem with your .pem file name
This will change the keys to be only readable by you.