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How to Clear DNS Cache to Fix ERR_NAME_NOT_RESOLVED - Setting Up Cloudflare Origin SSL on Apache-Fix 521 Origin Connection Error After Server Update

Updated 2026-07-28 23:18:30windows-fixes
How to Clear DNS Cache to Fix ERR_NAME_NOT_RESOLVED - Setting Up Cloudflare Origin SSL on Apache-Fix 521 Origin Connection Error After Server Update
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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