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Home / office-tools / Fix 'Cannot Access File Because It Is Locked' in Command Prompt - Real-Time Protection Won't Turn On in Windows Security-Troubleshooting Windows Defender Connection Errors Post-Update

Fix 'Cannot Access File Because It Is Locked' in Command Prompt - Real-Time Protection Won't Turn On in Windows Security-Troubleshooting Windows Defender Connection Errors Post-Update

Updated 2026-06-14 15:25:57office-tools
Fix 'Cannot Access File Because It Is Locked' in Command Prompt - Real-Time Protection Won't Turn On in Windows Security-Troubleshooting Windows Defender Connection Errors Post-Update
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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