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Fix Outlook 'Connection Refused' Error During Exchange Server Setup - Checklist for Resolving Windows Security 504 Gateway Timeout-Troubleshoot Outlook Snap Crash on Ubuntu

Updated 2026-06-14 07:27:13backup-recovery
Fix Outlook 'Connection Refused' Error During Exchange Server Setup - Checklist for Resolving Windows Security 504 Gateway Timeout-Troubleshoot Outlook Snap Crash on Ubuntu
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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