How to Fix 'Port Already Allocated' for Windows Update Service - Resolve Windows Update 502 Bad Gateway with Proxy Fixes-Windows Security Backup Configuration Guide

Updated 2026-06-19 07:03:02backup-recovery
How to Fix 'Port Already Allocated' for Windows Update Service - Resolve Windows Update 502 Bad Gateway with Proxy Fixes-Windows Security Backup Configuration Guide
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.