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Merge pull request #8226 from sazankha/patch-6

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Added fix for TCP fragmentation issue
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Denise Vangel-MSFT 2020-09-14 10:35:11 -07:00 committed by GitHub
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windows/security/threat-protection/microsoft-defender-application-guard/faq-md-app-guard.md
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@ -8,7 +8,7 @@ ms.pagetype: security
ms.localizationpriority: medium
author: denisebmsft
ms.author: deniseb
ms.date: 08/17/2020
ms.date: 09/14/2020
ms.reviewer:
manager: dansimp
ms.custom: asr
@ -172,3 +172,11 @@ To understand why it is not enabled in Enterprise mode, check the status of the
For CSP (Intune) you can query the status node by using **Get**. This is described in the [Application Guard CSP](https://docs.microsoft.com/windows/client-management/mdm/windowsdefenderapplicationguard-csp). On this page, you will see the **status** node as well as the meaning of each bit. If the status is not 63, you are missing a prerequisite.
For Group Policy you need to look at the registry. See **Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HVSIGP** Status. The meaning of each bit is the same as the CSP.
### I'm encountering TCP fragmentation issues, and cannot enable my VPN connection. How do I fix this?
WinNAT drops ICMP/UDP messages with packets greater than MTU when using Default Switch or Docker NAT network. Support for this has been added in [KB4571744](https://www.catalog.update.microsoft.com/Search.aspx?q=4571744). To fix the issue, install the update and enable the fix by following these steps:
1. Ensure that the FragmentAware DWORD is set to 1 in this registry setting: `\Registry\Machine\SYSTEM\CurrentControlSet\Services\Winnat`.
2. Reboot the device.