What is the most common cause of this error, and how can I resolve it?

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Grade: Education Subject: Support
What is the most common cause of this error, and how can I resolve it?
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The most common cause is running Windows Firewall with Advanced Security as a standard user instead of an administrator. To fix this, right-click the 'Windows Firewall with Advanced Security' icon in the system tray and select 'Run as administrator'. Alternatively, you can change the user account under which the service runs.