Fix Windows Defender Threat Service Permission Denied Error - Windows Activation Timeout: Clear DNS Cache Step-by-Step-Fix SSH Host Key Verification Failed by Clearing known_hosts

Updated 2026-06-17 19:21:32windows-fixes

Fix Windows Defender Threat Service Permission Denied Error - Windows Activation Timeout: Clear DNS Cache Step-by-Step-Fix SSH Host Key Verification Failed by Clearing known_hosts

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.