EC2 - Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

• EC2 login Issue
• ssh -i /root/stage.pem root@ec2-54-<>.compute-1.amazonaws.com
• ERROR
• EC2 - Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

• Reason
• There is a chance PEM file not added to ~/.ssh/authorized_keys 

Solution

• Go to EC2 Dashbaord
• Click on Connect (EC2 Instance Connect)

• Open ~/.ssh/authorized_keys
• Add the entry
• ssh-rsa AAAAB3NzaC1yc2EAAAA<....>nJXw== Staging
• Try to SSH again
• Done