How to Fix: Receiving error when trying to use ~/.ssh/config "ssh: Could not resolve hostname"

The error 'ssh: Could not resolve hostname bastion: Name or service not known' occurs when SSH is unable to connect to the specified host, in this case, the bastion server. This issue affects users who have configured their SSH clients with a ~/.ssh/config file and are trying to use it to connect to remote hosts.

This error can be frustrating as it prevents users from establishing connections to their remote servers. However, by following the steps outlined below, users should be able to resolve this issue and successfully connect to their bastion server using their local profile.

🛑 Root Causes of the Error

• The primary reason for this error is that the SSH client is not able to resolve the hostname of the bastion server. This can happen if the DNS resolution fails or if the hostname is not properly configured in the ~/.ssh/config file.
• Another alternative cause could be related to permissions issues with the keypair used for authentication.

🚀 How to Resolve This Issue

💡 Conclusion

To resolve the 'ssh: Could not resolve hostname bastion' error, first verify that the DNS resolution is working correctly and check the ~/.ssh/config file for any typos or incorrect hostnames. If the issue persists, try connecting to the bastion server using the ssh -F config bastion command with a local user account to determine if the problem is related to keypair permissions.