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Fix 'git pull failed index.lock file exists' Error - Cloudflare 521 Error: DNS and Server Checks-Setup.py Dependency Conflict Troubleshooting

Updated 2026-07-28 14:06:01windows-fixes
Fix 'git pull failed index.lock file exists' Error - Cloudflare 521 Error: DNS and Server Checks-Setup.py Dependency Conflict Troubleshooting
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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