Fix Windows 10 Search Indexing Not Working After Update - Checklist for Resolving Nginx 403 Forbidden-Cloudflare Error 521: Web Server Down Checklist

Updated 2026-07-28 11:49:35macos-help
Fix Windows 10 Search Indexing Not Working After Update - Checklist for Resolving Nginx 403 Forbidden-Cloudflare Error 521: Web Server Down Checklist
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.