From Instances list select the instance you are interested in.To do this, you have to create a specific rule for the Security Group of your EC2 instance. In general, remember you have to allow your EC2 instance to accept inbound SSH traffic. Elastic Beanstalk will create for you new instances associated with the new key pair.You may have to refresh the list in order to see a new Key Pair you're just created. In Server Form check the EC2 Key Pair input and select your new Key Pair.From left side menù select Configuration.Select your application from All Applications Tab.You can work around the problem if your instance is used by an application on Elastic Beanstalk.You have to create a new instance that uses a new Key Pair.

There's no way to change Key Pair on an instance.In this case the problem arises from lost Key Pair. SSH is usually pretty explicit about what went wrong if you care to add the -v option to your SSH command and read the output, as explained in many other answers to this question. Otherwise, if ec2-user and root don't work, check with your AMI provider.įinally, be aware that there are many other reasons why authentication would fail. For Fedora, the user name is either fedora or ec2-user. For RHEL5, the user name is either root or ec2-user. You'll specify the private key (.pem) file and For Amazon Linux, the user name is ec2-user. Use the ssh command to connect to the instance. But you can find some in AWS EC2 documentation, bullet point 4. will also happen if you have messed up the /home//.ssh/authorized_keys file on your EC2 instance.Ībout 2., the information about which username you should use is often lacking from the AMI Image description. Is that the right host you are trying to log in to? ubuntu is the username for the ubuntu based AWS distribution, but on some others it's ec2-user (or admin on some Debians, according to Bogdan Kulbida's answer)(can also be root, fedora, see below) Trying to connect with the wrong username.Are you sure this instance is using this keypair? These are common reasons that can cause that: This error message means you failed to authenticate.

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