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Here's How to fix Windows Defender.
i. Here are some steps you can take to fix Windows Defender turned off by group policy:

Open the Local Group Policy Editor (gpedit.msc).
Navigate to Computer Configuration - Administrative Templates - Windows Components - Windows Defender Antivirus.
Double-click on Turn off Windows Defender Antivirus.
Set the policy to Disabled.
Click OK and then close the Group Policy Editor.
Restart your computer.

If the above steps do not fix the problem, you may need to contact your system administrator or IT department for assistance.

Here are some additional tips for fixing Windows Defender turned off by group policy:
Make sure that you are logged in as an administrator.
If you are using a domain-joined computer, you may need to contact your domain administrator for assistance.
If you have recently installed any new software, uninstall it and see if that fixes the problem.
If you are still having problems, you can try resetting Windows Defender to its default settings. To do this, open the Windows Defender Security Center app and click on Virus & threat protection - Virus & threat protection settings - Manage settings. Under Windows Defender Antivirus, click on Reset.

ii. The error code 0x800704ec is a Windows error that can occur when trying to turn on Windows Defender. It can be caused by a number of things, including:
A third-party antivirus program is installed and enabled.
A Windows Defender service is disabled.
A Windows Defender setting is incorrect.
A Windows Defender file is corrupted.

To fix the error code 0x800704ec, try the following steps:
Disable any third-party antivirus programs that are installed.
Enable the Windows Defender services that are disabled.
Check the Windows Defender settings and make sure that they are correct.
Run a System File Checker (SFC) scan to repair any corrupted Windows Defender files.

If the above steps do not fix the error code 0x800704ec, you may need to reset Windows Defender to its default settings. To do this, open the Windows Defender Security Center app and click on Virus & threat protection - Virus & threat protection settings - Manage settings. Under Windows Defender Antivirus, click on Reset.

If you are still having problems, you may need to contact Microsoft support for further assistance.

iii. Here are some steps you can take to fix Windows Defender Firewall error code 0x6d9:

Restart your computer.
Check if Windows Defender Firewall is turned on.
Check if Windows Defender Firewall is blocking any applications or ports.
Reset Windows Defender Firewall to its default settings.
Uninstall any third-party antivirus programs that you have installed.
Run a System File Checker (SFC) scan to repair any corrupted Windows files.
Restore your computer to a previous point in time.
Contact Microsoft support for further assistance.

Here are some additional tips for fixing Windows Defender Firewall error code 0x6d9:
Make sure that you are logged in as an administrator.
If you are using a domain-joined computer, you may need to contact your domain administrator for assistance.
If you have recently installed any new software, uninstall it and see if that fixes the problem.
If you are still having problems, you can try disabling Windows Defender Firewall and see if that fixes the problem. If it does, you can try enabling Windows Defender Firewall again and see if that fixes the problem.

iv. If you have tried all of the above solutions and Windows Defender is still not working, you may need to reinstall Windows.

To reinstall Windows, you will need to create a bootable media. You can do this by using a USB drive or a DVD. Once you have created the bootable media, you can follow these steps to reinstall Windows:

Boot your computer from the bootable media.
Follow the on-screen instructions to reinstall Windows.
Once Windows has been reinstalled, Windows Defender will be enabled by default.

If you are still having problems with Windows Defender, you may need to contact Microsoft support for further assistance.

v. Here are the steps on how to fix the Windows Defender Firewall rule HSS DNS leak rule is blocking connection in Windows 10:

Open Windows Defender Firewall.
Click on Allow an app or feature through Windows Defender Firewall.
Click on Change settings.
Under Private network, uncheck the box next to HSS DNS leak rule.
Click on OK.
Restart your computer.
If you are still having problems, you can try the following:

Disable Windows Defender Firewall and see if that fixes the problem. If it does, you can try enabling Windows Defender Firewall again and see if that fixes the problem.
Uninstall any third-party antivirus programs that you have installed.
Run a System File Checker (SFC) scan to repair any corrupted Windows files.
Restore your computer to a previous point in time.
Contact Microsoft support for further assistance.