Troubleshoot connecting to your instance. For Amazon Linux 2 or the Amazon Linux AMI, the user name is ec2-user.. For a CentOS AMI, the user name is centos.. For a Debian AMI, the user name is admin.. For a Fedora AMI, the user name is ec2-user or fedora.. For a RHEL AMI, the user name is ec2-user or root.. For a SUSE AMI, the user name is ec2-user or root.. For an Ubuntu AMI, the user name is …
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstancesConnecting.html

