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Fixing Cloudflare 521 Error After Server Restart - Nginx Port 80 Connection Refused: Causes and Fixes-How to Fix Windows Cannot Access Shared Folder

Updated 2026-07-28 23:24:12browser-issues
Fixing Cloudflare 521 Error After Server Restart - Nginx Port 80 Connection Refused: Causes and Fixes-How to Fix Windows Cannot Access Shared Folder
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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