
Windows Defender Cannot Connect: Troubleshooting Checklist
You open Windows Security and see a message like "Windows Defender cannot connect" or "Check your...

You open Windows Security and see a message like "Windows Defender cannot connect" or "Check your...

You open the Start menu or File Explorer to search for a file, and nothing happens — or you see a...

You open Command Prompt and see an error like "Invalid configuration" followed by a code...

You've waited for a Windows update to finish, but it's stuck at 100% for minutes or hours. This i...

You're installing or upgrading Windows 10 and see the error: "BitLocker module not found"...

If you see a "504 Gateway Timeout" error when running Windows Update, and your system uses a prox...