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Fix Cloudflare Error 521 on Apache Server - Resolve Outlook's Path Not Found Error When Opening PST-Fix SSL Certificate Error in Windows Search Indexing

Updated 2026-06-14 03:52:45browser-issues
Fix Cloudflare Error 521 on Apache Server - Resolve Outlook's Path Not Found Error When Opening PST-Fix SSL Certificate Error in Windows Search Indexing
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.