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Fix VS Code GitHub Authentication Failed Error - Resolve 'index.lock File Exists' in SourceTree-How to Resolve Error 521 Web Server Down

Updated 2026-07-28 13:23:06developer-tools
Fix VS Code GitHub Authentication Failed Error - Resolve 'index.lock File Exists' in SourceTree-How to Resolve Error 521 Web Server Down
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.