Sometimes you may need more than one key, so to specify which key you are using for the SSH connection, you have to specify it when connecting with SSH
ssh -i name_of_key.pem user@IP
If you are connecting to an Ubuntu machine using AWS, the user will be “ubuntu” but in other case it may be “ec2-user“
Another thing to note, is that may need to change the permissions of your key so it works.
chmod 400 name_of_key.pem
And that if you get a .cer instead of a .pem it should work just fine.
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