How to Block or Unblock a Program in Windows Defender Firewall

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Programs and websites that suspiciously contain dangerous software might found their way filtered by the Windows Defender Firewall. But of course, the detection can be wrong sometimes, leading to a false warning which basically forcing users to ‘unblock’ the program from the red list.

The same thing could happen in the opposite end; dangerous programs might already lurking in your computer without the security system aware of the malware presence.

If that was the case, it’s up to you to unblock or block a program in Windows Defender. See the guide below for more details.

1. Launch the Start menu, search and run for Control Panel.

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2. Next, select System and Security.

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3. Head to Windows Defender Firewall.

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4. On the left panel, click Allow an app or feature through Windows Defender Firewall.

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5. Hit Change settings.

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6. Now check or uncheck on programs you want to allow or block. If a program not listed, you may Allow another app and browse the executable manually.

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You may have to restart the computer to take the effect. Be sure to check any third-party security software and see if the same program was blocked or unblocked, you may need to change the setting on that too.

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