修复无法激活 Windows Defender 防火墙：  ^{(Fix Unable to Activate Windows Defender Firewall: )}Windows 10最重要的内置功能之一是Windows Defender，它可以阻止恶意病毒和程序攻击您的计算机。但是当Windows Defender突然停止工作或响应时会发生什么？是的，这是许多Windows 10用户面临的问题，他们无法激活Windows Defender 防火墙^{(Windows Defender Firewall)}。有几个问题可能会导致Windows Defender 防火墙^{(Windows Defender Firewall)}停止工作。

此问题的最常见原因之一是您是否安装了任何第三方反恶意软件^{(Antimalware)}程序。原因^(Reason)是，如果同一台计算机上存在任何其他防病毒软件， ^(Antivirus)Windows Defender会自动关闭。另一个原因可能是日期和时区不匹配。不用担心，我们将重点介绍几种可能的解决方案，它们将帮助您立即在系统上激活Windows Defender 防火墙。^{(Windows Defender Firewall)}

修复无法在 Windows 10 中打开 Windows 防火墙^{(Can’t turn on Windows Firewall in Windows 10)}

确保 创建一个还原点^{(create a restore point)}以防万一出现问题。

方法 1：禁用 3rd 方防病毒软件^{(Method 1: Disable 3rd party Antivirus Software)}

1.右键单击系统托盘中的防病毒程序图标^{( Antivirus Program icon)}，然后选择禁用。^(Disable.)

2.接下来，选择防病毒软件将保持禁用的时间范围。^{( Antivirus will remain disabled.)}

3.完成后，再次尝试访问Windows Defender并检查您是否能够修复无法激活 Windows Defender 防火墙问题。^{(Fix Unable to Activate Windows Defender Firewall issue.)}

4.如果成功，请确保完全卸载您的第三方杀毒^{(uninstall your third-party Antivirus)}软件。

方法 2：重新启动 Windows Defender 防火墙服务^{(Method 2: Restart Windows Defender Firewall Service)}

让我们从重新启动Windows 防火墙^{(Windows Firewall)}服务开始。某些东西可能会破坏其功能，因此重新启动防火墙^(Firewall)服务可能会解决问题。 

1.按Windows key + R然后键入services.msc并按 Enter。

2.在service.msc窗口下找到Windows Defender 防火墙。^{(Windows Defender Firewall)}

3.右键单击Windows Defender 防火墙^{(Windows Defender Firewall)}并选择重新启动^{(Restart )}选项。

4.再次右键单击Windows ^(ight-click)Defender^(r)防火墙^{(Windows Defender Firewall)}并选择属性。^{(Properties.)}

5.确保启动类型^{(startup type)}设置为自动。 ^{(Automatic. )}

方法 3：注册表调整^{(Method 3: Registry Tweak)}

对注册^(Register)进行更改是危险的，因为任何错误的输入都可能损坏您的注册表文件，进而损坏您的操作系统。因此，在继续之前，请确保您了解调整注册表的风险。此外，在继续之前创建一个还原点并备份您的注册表。^{(backup your registry)}

您需要调整一些注册表文件以再次激活Windows Defender 防火墙^{(Windows Defender Firewall)}。 

1.按Windows key + R然后键入regedit并按 Enter。

2.导航到下面提到的路径。

HKEY_LOCAL_MACHINESYSTEM/CurrentControlSet/services/BFE

3.右键单击BFE并选择权限^{(Permissions)}选项。

4.遵循本指南^{(this guide)}以完全控制或拥有上述注册表项。

5.一旦您授予权限，然后在“组或用户名”下选择所有人，并在“所有人的权限”下选中“^(Everyone)完全控制^{(Full Control)}”。

6.单击应用，然后单击确定。

7.重新启动计算机以保存更改。

您会发现此方法适用于大多数用户，因为此方法取自Microsoft官方论坛，因此您可以使用此方法修复无法激活 Windows Defender 防火墙的问题^{(Fix Unable to Activate Windows Defender Firewall issue)}。

方法 4：通过注册表编辑器启用 Windows Defender^{(Method 4: Enable Windows Defender through Registry Editor)}

1.按 Windows 键 + R 然后键入regedit并按 Enter。

2.导航到以下注册表项：

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinDefend

3.现在右键单击WinDefend并选择权限。^{(Permissions.)}

4.遵循本指南^{(this guide)}以完全控制或拥有上述注册表项。

5.之后确保您选择了WinDefend^(WinDefend)，然后在右侧窗口中双击Start DWORD。

6. 将值数据字段中的值更改为2，然后单击确定。

7.关闭注册表编辑器^{(Registry Editor)}并重新启动您的 PC。

8.再次尝试启用 Windows Defender^{(enable Windows Defender)}，您应该能够修复无法激活 Windows Defender 防火墙的问题。 ^{( Fix Unable to Activate Windows Defender Firewall issue. )}

方法 5：重置 Windows Defender 防火墙设置^{(Method 5: Reset Windows Defender Firewall Settings)}

1.在Windows 搜索^{(Windows Search)}栏中键入控制面板^{(control panel)}，然后从搜索结果中单击控制面板。^{(Control Panel)}

2.从控制面板^{(Control Panel)}窗口中选择系统和安全选项。^{( System and Security)}

3.现在点击Windows Defender 防火墙。 ^{(Windows Defender Firewall. )}

4.接下来，从左侧窗格中，单击恢复默认值^{( Restore Defaults )}链接。

5.现在再次单击恢复默认值按钮。^{(Restore Defaults button.)}

6.单击是^(Yes)确认更改。

方法 6：使用命令提示符强制重置 Windows 防火墙^{(Method 6: Forcibly Reset Windows Firewall using Command Prompt)}

1.在Windows 搜索^{(Windows Search)}中键入 cmd 或命令，然后右键单击命令提示符^{(Command Prompt)}并选择以管理员身份运行。^{(Run as administrator.)}

2.一旦提升的命令提示符打开，您需要键入以下命令并按 Enter：

netsh firewall set opmode mode=ENABLE exceptions=enable

3.关闭命令提示符并重新启动^(Reboot)系统以保存更改。

方法 7：安装最新的 Windows 更新^{(Method 7: Install the latest Windows Updates)}

如果您的系统不是最新的，即存在您需要下载和安装的待处理更新，有时会出现无法激活 Windows Defender 防火墙的问题。^{(Activate Windows Defender Firewall)}因此，您需要检查是否有任何最新的 Windows 更新可供安装：

1.按Windows Key + I 打开设置^(Settings)，然后单击“更新和安全^{(Update & Security)}”图标。

2.现在从左侧窗格中确保选择Windows 更新。^{(Windows Update.)}

3.下一步，单击“检查更新^{(Check for updates)}”按钮，让Windows下载并安装任何待处理的更新。

方法 8：卸载最新的 Windows 安全更新^{(Method 8: Uninstall latest Windows Security Updates)}

如果问题是在您使用最新的安全补丁更新Windows后开始的，那么您可以卸载安全更新以修复无法激活 Windows Defender 防火墙。^{( Fix Unable to Activate Windows Defender Firewall.)}

1.按 Windows 键 + I 打开设置^(Settings)，然后单击更新和安全^{(Update & Security)}。

2.单击“Windows 更新”部分下的“查看已安装更新历史记录”。^{( View installed update history)}

3.卸载所有最新更新^{(Uninstall all latest updates)}并重新启动设备。

方法 9：^{(Method 9: U)}更新 Windows Defender^{(pdate Windows Defender)}

1.按Windows Key + X然后选择命令提示符（管理员）。^{(Command Prompt (Admin).)}

2.在cmd中输入^(Enter)以下命令并在每个命令后按Enter：

“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -RemoveDefinitions -All

“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -SignatureUpdate

3.一旦命令完成处理，关闭 cmd 并重新启动您的 PC。

方法 10：^{(Method 10:)} 设置正确的日期和时间^{(Set Correct Date & Time)}

1.右键单击任务栏上的日期和时间^{( date and time)}，然后选择“Adjust date/time”。

2.如果在 Windows 10 上，请确保打开“^{(turn ON)}自动设置时间^{(Set Time Automatically)}”和“自动设置时区^{(Set time zone automatically)}”下的切换开关。

3.对于其他人，点击“互联网时间^{(Internet Time)}”并勾选“自动与互联网时间服务器同步^{(Automatically synchronize with an Internet time server)}”。

4.选择服务器“ time.windows.com ”然后单击更新^(Update)，然后单击确定。您无需完成更新，只需单击确定。

受到推崇的：^{(Recommended:)}

• 7-Zip vs WinZip vs WinRAR（最佳文件压缩工具）^{(7-Zip vs WinZip vs WinRAR (Best File Compression Tool))}
• Where is NOTEPAD in Windows 10? 6 Ways to open it!
• 修复无线路由器不断断开或掉线^{(Fix Wireless Router Keeps Disconnecting Or Dropping)}
• 无需恢复出厂设置即可删除 Android 病毒^{(Remove Android Viruses Without a Factory Reset)}

我希望本文对您有所帮助，现在您可以轻松修复无法激活 Windows Defender 防火墙^{( Fix Unable to Activate Windows Defender Firewall)}，但如果您对本教程仍有任何疑问，请随时在评论部分提出。

Fix Unable to Activate Windows Defender Firewall

Fix Unable to Activate Windows Defender Firewall: One of the most important inbuilt features of Windows 10 is the Windows defender, which stops malicious virus & programs to attack your computer. But what happens when the Windows Defender suddenly stop working or responding? Yes, this is the problem faced by many Windows 10 users and they are unable to activate Windows Defender Firewall. There are several issues which can cause Windows Defender Firewall to stop working.

One of the most common reasons for this issue is if you have installed any third-party Antimalware programs. Reason being, Windows Defender automatically shut itself down if any other Antivirus software is present on the same computer. Another reason could be the date and time zone mismatch. Don’t worry we will highlight several probable solutions which will help you to get your Windows Defender Firewall activated on your system in no time.

Fix Can’t turn on Windows Firewall in Windows 10

Make sure to create a restore point just in case something goes wrong.

Method 1: Disable 3rd party Antivirus Software

1.Right-click on the Antivirus Program icon from the system tray and select Disable.

2.Next, select the time frame for which the Antivirus will remain disabled.

3.Once done, again try to access Windows Defender and check if you’re able to Fix Unable to Activate Windows Defender Firewall issue.

4.If successful then make sure to uninstall your third-party Antivirus software completely.

Method 2: Restart Windows Defender Firewall Service

Let’s start with restarting the Windows Firewall service. It may be possible that something disrupted its functioning, hence restarting the Firewall service may solve the problem. 

1.Press Windows key + R then type services.msc and hit Enter.

2.Locate Windows Defender Firewall under the service.msc window.

3.Right-click on Windows Defender Firewall and select the Restart option.

4.Again right-click on Windows Defender Firewall and choose Properties.

5.Make sure that the startup type is set to Automatic. 

Method 3: Registry Tweak

Making changes to Register is dangerous, as any wrong entry can damage your registry files which in turn will damage your operating system. So before continuing make sure you understand the risk with tweaking registry. Also, create a restore point and backup your registry before continuing.

You need to tweak some registry files to activate the Windows Defender Firewall again. 

1.Press Windows key + R then type regedit and hit Enter.

2.Navigate to the below-mentioned path.

HKEY_LOCAL_MACHINESYSTEM/CurrentControlSet/services/BFE

3.Right-click on BFE and choose Permissions option.

4.Follow this guide in order to take full control or ownership of the above registry key.

5.Once you have given permission then select Everyone under “Group or user names” and checkmark Full Control under Permissions for All.

6.Click Apply followed by OK.

7.Reboot your computer to save changes.

You will find this method to work for most of the users as this method is taken from the Microsoft official forum, so you can expect to Fix Unable to Activate Windows Defender Firewall issue with this method.

Method 4: Enable Windows Defender through Registry Editor

1.Press Windows Key + R then type regedit and hit Enter.

2.Navigate to the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WinDefend

3.Now right-click on WinDefend and select Permissions.

4.Follow this guide in order to take full control or ownership of the above registry key.

5.After that make sure you have selected WinDefend then in the right window double-click on Start DWORD.

6.Change the value to 2 in the value data field and click OK.

7.Close Registry Editor and reboot your PC.

8.Again try to enable Windows Defender and you should be able to Fix Unable to Activate Windows Defender Firewall issue. 

Method 5: Reset Windows Defender Firewall Settings

1.Type control panel in Windows Search bar then click on Control Panel from the search result.

2.Select System and Security option from the Control Panel window.

3.Now click on Windows Defender Firewall. 

4.Next, from the left-hand window pane, click on the Restore Defaults link.

5.Now again click on the Restore Defaults button.

6.Click on Yes to confirm the changes.

Method 6: Forcibly Reset Windows Firewall using Command Prompt

1.Type cmd or command in Windows Search then right-click on Command Prompt and select Run as administrator.

2.Once the elevated command prompt opens, you need to type the following command & hit Enter:

netsh firewall set opmode mode=ENABLE exceptions=enable

3.Close the command prompt and Reboot your system to save changes.

Method 7: Install the latest Windows Updates

Sometimes Unable to Activate Windows Defender Firewall issue occurs if your system is not up to date i.e. there are pending updates available which you need to download & install. Therefore, you need to check whether any latest Windows updates are available to install or not:

1.Press Windows Key + I to open Settings then click on “Update & Security” icon.

2.Now from the left-hand window pane make sure to select Windows Update.

3.Next, click on “Check for updates” button and let Windows download & install any pending updates.

Method 8: Uninstall latest Windows Security Updates

If the issue started after you updated the Windows with the latest security patches, then you can uninstall the security update in order to Fix Unable to Activate Windows Defender Firewall.

1.Press Windows key + I to open Settings then click on Update & Security.

2.Click on View installed update history under the Windows Update section.

3.Uninstall all latest updates and reboot the device.

Method 9: Update Windows Defender

1.Press Windows Key + X then select Command Prompt (Admin).

2.Type the following command into cmd and hit Enter after each one:

“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -RemoveDefinitions -All

“%PROGRAMFILES%\Windows Defender\MPCMDRUN.exe” -SignatureUpdate

3.Once the command finishes processing, close cmd and reboot your PC.

Method 10: Set Correct Date & Time

1.Right-click on date and time on the taskbar and then select “Adjust date/time“.

2.If on Windows 10, make sure to turn ON the toggle under “Set Time Automatically” and “Set time zone automatically“.

3.For others, click on “Internet Time” and tick mark on “Automatically synchronize with an Internet time server.”

4.Select Server “time.windows.com” then click Update followed by OK. You don’t need to complete the update, just click OK.

Recommended:

• 7-Zip vs WinZip vs WinRAR (Best File Compression Tool)
• Where is NOTEPAD in Windows 10? 6 Ways to open it!
• Fix Wireless Router Keeps Disconnecting Or Dropping
• Remove Android Viruses Without a Factory Reset

I hope this article was helpful and now you can easily Fix Unable to Activate Windows Defender Firewall, but if you still have any questions regarding this tutorial then feel free to ask them in the comment’s section.

Related posts

• Fix Unable打开Local Disk（c :)

• Fix Unable安装Network Adapter Error Code 28

• Windows 10中Fix Unable至Delete Temporary Files

• Windows 10 Fix Unable至Install DirectX

• Fix Unable至Download Windows 10创作者更新

• Fix Windows的本副本不是真正的错误

• Fix Computer直到重新启动多次

• Fix ARK Unable至Invite至Query Server Info

• 如何修复无法激活 iPhone (2022)

• Fix Computer Wo在Windows 10中没有转到Sleep Mode

• Fix Windows无法完成格式

• 如何在Windows上打开Fix Avast

• Fix Computer无法识别iPhone

• 如何阻止或取消阻止 Windows Defender 防火墙中的程序

• Fix Windows Defender Update使用error 0x80070643失败

• Windows Fix Host Process Windows Services已停止工作

• Fix Desktop Refers到不可用的位置

• Your Android Phone上的Fix Unable至Download Apps

• 修复在 Windows 11 中无法连接到 EA 服务器

• Fix 0xc00007b错误：Application Was Unable启动Correctly