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Fix PowerShell Authentication Failed Credentials Error - Fix Windows Defender Network Error After Update-PuTTY Connection Refused: Causes and Fixes

Updated 2026-06-15 18:31:34windows-fixes
Fix PowerShell Authentication Failed Credentials Error - Fix Windows Defender Network Error After Update-PuTTY Connection Refused: Causes and Fixes
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.