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Turn on system firewall function: Windows 7 system security settings

When the user's firewall is closed, the “White Flag” icon on the notification bar will prompt a user with a red cross to prompt the user to “close the firewall”. The firewall is a protective door in the Windows
system. If it is closed, it is vulnerable to virus intrusion, so we have to open this door to prevent virus intrusion.

1, click “Start”Menu opens “Control Panel”.

1. Select “System & Security" in “Control Panel”.

3. Click on “Windows Firewall" in the &Systems & Security panel.

4. Click “Use recommended settings”.

5, after the state of the firewall is started! Under the notification bar, the "white flag" icon has disappeared.
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