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Fix Windows Defender SSL Certificate Errors from Antivirus Interference - How to See What's Listening on Port 3389-How to Fix Antivirus Port Already Allocated Error

Updated 2026-06-13 23:56:39security-tools
Fix Windows Defender SSL Certificate Errors from Antivirus Interference - How to See What's Listening on Port 3389-How to Fix Antivirus Port Already Allocated Error
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.

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