If you have problems connecting to your EC2 instance from the bastion host, do the following: Troubleshoot the connection from the bastion host to your EC2 instance in " How do I troubleshoot problems connecting to my Amazon EC2 Linux instance using SSH?" to troubleshoot the issue. Based on the error message received, refer to step 2. If you still can't connect to the bastion host, then use the output messages obtained from the SSH client verbose messaging to identify the error message.Verify that ssh-add -L returns five or fewer keys.Verify that you added the private key of the bastion host to the SSH agent on your local machine correctly.If you have problems connecting to the bastion host from your local machine, do the following: Troubleshoot the connection from your local machine to the bastion host For details on how to manage the keys in ssh-agent, run the command man ssh-agent. Each administrator should have one key, so this is rarely a problem for most deployments. Therefore, make sure that the agent has five or fewer keys. Instances terminate the connection after five failed connection attempts. The ssh-agent sequentially tries all the keys that are loaded in the agent until one succeeds. $ ssh -v You don't need to explicitly provide a key in the preceding two commands. You can also use the public DNS entry instead of the public IP address. Replace 192.0.2.0 with the appropriate public IP address for your bastion host. In the following example command, replace ec2-user with your use rname. Connect to your EC2 instance from the bastion host, with verbose messaging onĪfter connecting to the bastion host, run the following command to connect to your EC2 instance using SSH with verbose messaging on. When connecting to your instance using a bastion host regularly (outside of troubleshooting), use Prox圜ommand or a similar method. Another user on the bastion host with the ability to modify files could use this key to authenticate as you. The socket file acts as the mechanism that forwards the key to your EC2 instance. When you set up agent forwarding, a socket file is created on the bastion host. Forwarding enables the local ssh-agent to respond to the public-key challenge, including when you connect from your bastion host to your EC2 instance. Agent forwarding should be used for troubleshooting only. $ ssh -v –A The -A option enables ssh-agent forwarding. In the following example command, replace ec2-user with your user name. Run the following command to connect to the bastion host using the -A option with verbose messaging on. Run the following command to verify that the keys are available to ssh-agent: $ ssh-add -LĢ. In the following example command, replace private-key.pem with the name of your private key. Add one or more private keys of your EC2 instance and bastion host to ssh-agent on your local machine. Resolution Set up SSH agent forwarding to log into the bastion host from your local machineġ. Then troubleshoot the connection from the bastion host to the EC2 instance. Start by troubleshooting the connection from your local machine to the bastion host.
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