Fix Outlook Connection Refused Error 0x80040115 - Fix Nginx 502 Bad Gateway: Checklist and Solutions-Troubleshoot OneDrive Memory Leak and Sync Error

Updated 2026-06-14 01:00:37developer-tools
Fix Outlook Connection Refused Error 0x80040115 - Fix Nginx 502 Bad Gateway: Checklist and Solutions-Troubleshoot OneDrive Memory Leak and Sync Error
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.