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Fix 'git pull failed index.lock file exists' Error - How to Fix nginx -t Failure After Adding proxy_pass-How to Fix Cloudflare Error 521: Web Server Is Down

Updated 2026-07-28 10:08:09macos-help

Fix 'git pull failed index.lock file exists' Error - How to Fix nginx -t Failure After Adding proxy_pass-How to Fix Cloudflare Error 521: Web Server Is 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.