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Fix Windows Defender SSL Certificate Errors from Antivirus Interference - Fix Windows Defender Port Already Allocated Error-Cloudflare 521 Error: Origin Server Unreachable – Fixes

2026-06-13 15:00:24
Fix Windows Defender SSL Certificate Errors from Antivirus Interference - Fix Windows Defender Port Already Allocated Error-Cloudflare 521 Error: Origin Server Unreachable – Fixes

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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