Download and run a tool to automatically diagnose and fix problems with Windows Firewall, such as service errors, remote assistance issues, or sharing blocks. The troubleshooter works for Windows 7, 8, and 10 in any language.

To turn Microsoft Defender Firewall on or off: Windows 11 Windows 10. Select Start , then open Settings . Under Privacy & security , select Windows Security > Firewall & network protection . Open Windows Security settings. Select a network profile: Domain network, Private network, or Public network.

Firewall & network protection in Windows Security lets you view the status of Microsoft Defender Firewall and see what networks your device is connected to. You can turn Microsoft Defender Firewall on or off and access advanced Microsoft Defender Firewall options for the following network types: Domain (workplace) networks.

Automatically repair Windows Firewall problems, such as Windows fails to start Windows Firewall service (0x5) or Windows remote assistance is not working.

Follow these steps to automatically diagnose and repair Windows security problems by turning on UAC, DEP protection, Windows Firewall, and other Windows security options and features. Select the Download button on this page.

When you try to change your Windows Firewall settings, the options are greyed out and you can't make any changes. To fix this, follow these steps: Click the Start button, then type Windows Firewall in the Search box. Click Windows Firewall, and then click Allow a program or feature through Windows Firewall. Click the Change settings button.

Start , click Run, type Services.msc, and then click OK. Cause. This problem can occur if the account that is used to start the Windows Firewall service does not have permissions to access the related registry entries. Resolution. Diagnose and fix the problem automatically. To fix the problem automatically, click the Fix-It image below.

Open Windows Security settings. Status icons indicate your level of safety: Green means there aren’t any recommended actions right now. Yellow means there is a safety recommendation for you. Red is a warning that something needs your immediate attention. Run a malware scan manually.

Select Device details. Select Manage in Windows Security. Select Quick scan. Tips: If you want a deeper scan, instead of selecting Quick scan in step 3, select Scan options and choose the type of scan you want. For the most complete scan, run Microsoft Defender Offline. For more about that see Help protect my PC with Microsoft Defender Offline.

Microsoft Defender is the simple way to protect your digital life and all of your devices. It's included as part of your Microsoft 365 Family, or Personal, subscription at no extra cost. Important: This article is about the Microsoft Defender app that is included with Microsoft 365 Family or Personal subscriptions.