![]() ![]() 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. Use the output messages from the SSH client to identify and troubleshoot issues.Connect to your EC2 instance from the bastion host with verbose messaging on.Set up SSH agent forwarding to log into the bastion host from your local machine.To troubleshoot connecting to an EC2 instance through SSH using a bastion host, do the following: ![]()
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