Immediate Fix (Method 1): Update Your Personal Access Token (PAT)
The fastest way to resolve the “git update failed authentication failed” error is to refresh your Personal Access Token. Most Git providers like GitHub or GitLab no longer accept standard account passwords for command-line operations.
| Action Step | Command / Instruction |
|---|---|
| Generate New Token | Go to Settings > Developer Settings > Personal Access Tokens. |
| Update Remote URL | git remote set-url origin https://<TOKEN>@github.com/USERNAME/REPO.git |
Simply replace <TOKEN> with your new PAT and ensure your username and repository name are correct. This immediately bypasses cached, expired credentials.
Technical Explanation: Why Did Authentication Fail?
This error typically occurs because the Git client is sending outdated or incorrect credentials to the remote server. Modern Git hosting services have deprecated password-based authentication in favor of token-based or SSH-based systems.
Common triggers include an expired Personal Access Token, a recently changed account password, or a corrupted local credential helper. When you run git pull or git push, the server rejects the request if the local handshake fails validation.
Alternative Methods to Fix Authentication Errors
Method 2: Clear Local Credential Cache
If your system is stuck using an old password, you need to force Git to “forget” the old data. This varies depending on your operating system.
For Windows users, use the following command to prompt a new login window next time you connect:
git credential-manager delete https://github.comFor macOS users, you may need to clear the entry in the Keychain Access app. Search for “github.com” or “git-creds” and delete the stored Internet password.
Method 3: Switch to SSH Authentication
SSH keys are more secure and don’t require you to manage tokens frequently. Once configured, you won’t encounter password-related authentication failures during updates.
First, generate a new SSH key if you don’t have one:
ssh-keygen -t ed25519 -C "[email protected]"After adding the public key to your Git provider’s settings, switch your remote URL from HTTPS to SSH:
git remote set-url origin [email protected]:USERNAME/REPOSITORY.git