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.

Learn how to enable or disable Microsoft Defender Firewall on Windows 11 or Windows 10. Find out why it's important to have it on and what to do if you get errors or need to allow an app through the firewall.

You can turn Microsoft Defender Firewall on or off and access advanced Microsoft Defender Firewall options for the following network types: Domain (workplace) networks. Private (trusted) networks. Public (untrusted) networks. If you want to change a setting, select the network type you want to change it on.

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.

In early versions of Windows 10, Windows Security is called Windows Defender Security Center. Virus & threat protection in Windows Security helps you scan for threats on your device.

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.

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.