SSH Key Rejected by GitHub or GitLab? Here Is How to Diagnose and Fix It

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Developers frequently misdiagnose SSH authentication failures with GitHub and GitLab, often troubleshooting a setup that is already working correctly. The message 'does not provide shell access' is actually a success response, while a genuine failure reads 'Permission denied (publickey)'. The most common real causes include a public key not yet registered with the hosting platform, SSH offering the wrong key when multiple keys exist, and a passphrase-protected key not loaded into the SSH agent. Running 'ssh -vT git@github.com' helps identify which key is being offered, and configuring the ~/.ssh/config file with 'IdentitiesOnly yes' ensures only the correct key is sent. Separately, a successful SSH test but a failing 'git push' usually points to a remote URL configured for HTTPS rather than SSH.

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ProgrammingDEV Community ·

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