How to troubleshoot SSH authentication agent connection errors on various systems

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The 'Could not open a connection to your authentication agent' error occurs when a shell cannot communicate with an SSH agent. This typically happens because the agent isn't running, the SSH_AUTH_SOCK variable is unset or points to a stale socket, or the agent is running in a different session. Troubleshooting steps differ across Linux, macOS, Windows, WSL, and Git Bash environments. Basic fixes involve checking the socket variable, verifying socket existence, and potentially starting a new agent with eval. Users can also bypass the agent entirely by using ssh -i to specify a key file directly.

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