The error occurs when your Git client cannot verify the identity of the remote server (like GitHub , GitLab, or Bitbucket) via SSH. This security check prevents "Man-in-the-Middle" attacks by ensuring the server you are connecting to is the one you expect. Core Causes of the Error
Automation environments (like Jenkins or GitHub Actions) often fail because they cannot interactively ask "Are you sure you want to continue connecting?" and simply abort. How to Fix the Error 1. Automated Fix (Recommended) Stack Overflow The error occurs when your Git client cannot
The server changed its SSH key (due to an upgrade, reinstall, or routine security rotation), but your computer still has the old one saved. How to Fix the Error 1
You are connecting to the server for the first time, and its fingerprint isn't in your known_hosts file yet. The remote server’s IP address changed, but it
The remote server’s IP address changed, but it is still associated with a different key in your local records.