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Fix 'Windows Update Port Already Allocated Permission Denied' - Troubleshoot Windows Defender Error Code 404-Resolve Command Prompt Version Mismatch in Setup

2026-06-13 22:30:22
Fix 'Windows Update Port Already Allocated Permission Denied' - Troubleshoot Windows Defender Error Code 404-Resolve Command Prompt Version Mismatch in Setup

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.

Next references

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