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Make sure Windows Defender Firewall is turned on for both private and public networks on your Windows computer.
Why this matters
The software firewall on your PC adds a second layer of protection, especially when you are on a public or unfamiliar Wi-Fi network.
How to do it
- Open Windows Security (search for it in the Start menu)
- Click 'Firewall & network protection'
- Check that the firewall is On for Domain, Private, and Public networks
- Click any that show 'Off' and turn them on
Need a more detailed walkthrough?
Our step-by-step guide explains each action in full detail, with confirmation steps and related tasks.
View full step-by-step guide →Cyber Essentials framework
This task falls under the Firewallscontrol, one of five areas assessed in the UK's Cyber Essentials scheme. Completing it counts toward your Cyber Essentials alignment. Create a free account to track your progress across all five areas.
Frequently asked questions
Is Windows Defender Firewall free?
Yes. It is built into every version of Windows and costs nothing. It is managed through Windows Security, which is also free and built in.
What is the difference between Windows Defender Firewall and my router's firewall?
Your router firewall protects your entire network by blocking inbound connections from the internet. Windows Defender Firewall protects your individual computer, and it is especially useful when you connect to unfamiliar networks such as public Wi-Fi, where your router-level protection may not be in place.
Will Windows Defender Firewall block apps I want to use?
Occasionally Windows will ask whether to allow a new app through the firewall when it first tries to connect to the internet. You can choose to allow it. Most legitimate apps request this access automatically: simply decline if you were not expecting the prompt or do not recognise the application.
I use a third-party antivirus. Does it include its own firewall?
Many paid antivirus packages include a software firewall. If yours does and it is active, Windows may turn off its own firewall to avoid conflicts; this is usually fine. Check that one firewall is active: either Windows Defender or your antivirus. You should never have both disabled at the same time.
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