How to Fix 'Port Already Allocated' for Windows Update Service - Fix Windows Defender Port Already Allocated Error-Windows Security Not Working After Update: 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.
Related Software Guides
Windows Defender Setup After a Fresh Install
Fix Windows Defender Real-Time Protection Grayed Out
Fix Windows Defender Dependency Conflict in Windows 10
Fixing Windows Security 502 Bad Gateway: Configuration Steps
Windows Update Not Downloading? Fix Network Connectivity Issues
Git Push Rejected Non Fast Forward: How to Fix