How to Fix Windows Defender Authentication Failed Error - Cannot Connect pgAdmin to Local PostgreSQL Server-502 Bad Gateway in Scheduled Tasks: Troubleshooting

Updated 2026-06-13 23:54:35security-tools
How to Fix Windows Defender Authentication Failed Error - Cannot Connect pgAdmin to Local PostgreSQL Server-502 Bad Gateway in Scheduled Tasks: Troubleshooting
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.