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Fix pgAdmin Cannot Connect to PostgreSQL on Localhost - Fix Windows Security 504 Gateway Timeout from Antivirus Conflict-Chrome Network Errors: A Beginner's Fix-It Checklist

2026-06-13 22:34:26windows-fixes
Fix pgAdmin Cannot Connect to PostgreSQL on Localhost - Fix Windows Security 504 Gateway Timeout from Antivirus Conflict-Chrome Network Errors: A Beginner's Fix-It Checklist

Final checklist

  • Confirm that the same symptom is gone after a restart or refresh.
  • Keep the smallest working change and undo temporary diagnostic settings.