SHELL

WARNING: UNPROTECTED PRIVATE KEY FILE!

sudo chmod -R 700 file_name.key

WARNING: UNPROTECTED PRIVATE KEY FILE!

sudo chmod -R 700 your-key.pem

Unprotected private key file

sudo chmod 600 ~/.ssh/<your key's name>

@ WARNING: UNPROTECTED PRIVATE KEY FILE! @

chmod 600 ~/.ssh/file.pem

Error: Unprotected private key file

Mac - [ec2-user ~]$ chmod 0400 .ssh/my_private_key.pem
Windows - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstancesConnecting.html#troubleshoot-unprotected-key

Unprotected private key file

cp <path to your key> ~/.ssh/<name of your key>

Unprotected private key file

ssh -i ~/.ssh/<name of your key> <username>@<ip address>