Why are connections to GitHub over SSH throwing an error "Warning: Remote Host Identification Has Changed"?

Many users have encountered the error message "Warning: Remote Host Identification Has Changed" when attempting to connect to GitHub over SSH. This issue arose on March 24, 2023, when GitHub updated their RSA SSH host key to protect users from potential security risks.

The solution to this problem is relatively straightforward:

1. Remove the Old RSA SSH Key of GitHub:
   Locate the file .ssh/known_hosts, which stores known host keys, and remove the entry for GitHub.com. This can be done by running the following command in your terminal:

ssh-keygen -R github.com

2. Update with the New SSH Key:
   Once the old key is removed, you need to obtain and add the new SSH key for GitHub.com to your .ssh/known_hosts file. This can be achieved by running the following command:

   curl -L https://api.github.com/meta | jq -r '.ssh_keys | .[]' | sed -e 's/^/github.com /' >> ~/.ssh/known_hosts

3. Reconnect to GitHub:
   After updating the SSH key, attempt to connect to GitHub again. You may encounter a prompt asking if you trust the new SSH key. Carefully verify the fingerprint of the new key and ensure that it matches the one provided by GitHub before entering yes to proceed.

If you continue to experience issues, you can refer to the GitHub blog post for additional troubleshooting steps.