April 2024 known issues

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Note this is only Microsoft based vpn connections impacted, not consumer based vpns.

VPN connections might fail after installing the April 2024 security update

Status Confirmed

Affected platforms Client Versions Message ID Originating KB Resolved KB Windows 11, version 23H2 WI789335 KB5036893 – Windows 11, version 22H2 WI789336 KB5036893 – Windows 11, version 21H2 WI789337 KB5036894 – Windows 10, version 22H2 WI789338 KB5036892 – Windows 10, version 21H2 WI789339 KB5036892 – Server Versions Message ID Originating KB Resolved KB Windows Server 2022 WI789340 KB5036909 – Windows Server 2019 WI789341 KB5036896 – Windows Server 2016 WI789342 KB5036899 – Windows Server 2012 R2 WI789343 KB5036960 – Windows Server 2012 WI789344 KB5036969 – Windows Server 2008 R2 SP1 WI789345 KB5036967 – Windows Server 2008 SP2 WI789346 KB5036932 –

Windows devices might face VPN connection failures after installing the April 2024 security update (the Originating KBs listed above) or the April 2024 non-security preview update. Next steps: We are working on a resolution and will provide an update in an upcoming release. Windows support: Home PC: If you need support with your personal or family account, use the Get help app in Windows. Enterprise devices: Request help for your organization through Support for business.

NTLM traffic issue after installing the April 2024 security update

Status Confirmed

Affected platforms Server Versions Message ID Originating KB Resolved KB Windows Server 2022 WI789351 KB5036909 – Windows Server 2019 WI789352 KB5036896 – Windows Server 2016 WI789353 KB5036899 – Windows Server 2012 R2 WI789354 KB5036960 – Windows Server 2012 WI789355 KB5036969 – Windows Server 2008 R2 SP1 WI789356 KB5036967 – Windows Server 2008 SP2 WI789357 KB5036932 –

After installing the April 2024 security update (the Originating KBs listed above) on domain controllers (DCs), you might notice a significant increase in NTLM authentication traffic. This issue is likely to affect organizations that have a very small percentage of primary domain controllers in their environment and high NTLM traffic. Next steps: We are working on a resolution and will provide an update in an upcoming release. Windows support: Enterprise devices: Request help for your organization through Support for business.

Susan Bradley Patch Lady/Prudent patcher

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olo, lmacri, Alex5723

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Susan Bradley wrote:

Note this is only Microsoft based vpn connections impacted, not consumer based vpns.

Could you explain what “Microsoft based VPN connections” means in practice please?

All the Message ID links are only available to work or school accounts.

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Meaning l2tp/ipsec vpns that businesses use.  I have not seen reports of consumer vpns having issues.  The link doesn’t have any more than what I posted above.

Susan Bradley Patch Lady/Prudent patcher

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b

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The patch list dated April 23 shows to install, but it seems issues have arisen after that post. Since I know nothing about vpn’s, are you saying it is ok to install since I use my computer for home use?

Thank you.

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HE48AEEXX77WEN4Edbtm wrote:

are you saying it is ok to install since I use my computer for home use?

Yes

1 user thanked author for this post.

HE48AEEXX77WEN4Edbtm

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