Tzhizhu
Home / macos-help / Fix Chrome DNS_PROBE_FINISHED_NXDOMAIN After Update - How to Fix Cloudflare Error 521 (Web Server Is Down)-Fix Chrome Authentication Failed on Mac: Step-by-Step

Fix Chrome DNS_PROBE_FINISHED_NXDOMAIN After Update - How to Fix Cloudflare Error 521 (Web Server Is Down)-Fix Chrome Authentication Failed on Mac: Step-by-Step

Updated 2026-06-14 18:11:10macos-help
Fix Chrome DNS_PROBE_FINISHED_NXDOMAIN After Update - How to Fix Cloudflare Error 521 (Web Server Is Down)-Fix Chrome Authentication Failed on Mac: Step-by-Step
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.

Related Software Guides

Fix Task Scheduler Connection Refused on Remote Computer Fix Task Scheduler Connection Refused on Remote Computer Fix Docker Compose Port Already in Use on Host Fix Docker Compose Port Already in Use on Host Fix Chrome Profile Sync Not Working Due to Invalid Configuration Fix Chrome Profile Sync Not Working Due to Invalid Configuration How to Fix Connection Refused in Windows Terminal How to Fix Connection Refused in Windows Terminal Fix Ubuntu Permission Denied Error in Windows Security Context Fix Ubuntu Permission Denied Error in Windows Security Context Fix Windows Security Not Starting Automatically After Boot Fix Windows Security Not Starting Automatically After Boot