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Security & Auth Error

Fix "Permission denied (publickey)" in SSH & GitHub

Q: How do I fix this instantly in my terminal?

On macOS & Linux run: "chmod 700 ~/.ssh && chmod 600 ~/.ssh/id_* && ssh-add ~/.ssh/id_*". On Windows PowerShell run: "icacls "$env:USERPROFILE\.ssh\id_rsa" /inheritance:r /grant:r "$($env:USERNAME):R"". This terminates the conflicting process or resets the state without rebooting your computer.

Developer guide and instant terminal command to diagnose and solve this error.

Terminal Output

$git@github.com: Permission denied (publickey). fatal: Could not read from remote repository.

Why Does This Error Happen?

Your SSH client did not offer a public key recognized by the remote server, or file permissions on ~/.ssh/id_rsa are too permissive.

Instant Terminal One-Liner Fixes

Choose your operating system

Linux (Bash / Zsh)

chmod 700 ~/.ssh && chmod 600 ~/.ssh/id_* && ssh-add ~/.ssh/id_*

macOS (Terminal / iTerm2)

chmod 700 ~/.ssh && chmod 600 ~/.ssh/id_* && ssh-add ~/.ssh/id_*

Windows (PowerShell Run as Administrator)

icacls "$env:USERPROFILE\.ssh\id_rsa" /inheritance:r /grant:r "$($env:USERNAME):R"

Comprehensive Step-by-Step Resolution

1Fix SSH key file permissions: "chmod 600 ~/.ssh/id_ed25519" and "chmod 700 ~/.ssh".
2Add key to SSH agent: "ssh-add ~/.ssh/id_ed25519".
3Test GitHub connectivity: "ssh -T git@github.com".

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