Windows 11 KB5020387 Out-of-band Update Solves Network Issues

Several users reported encountering network issues after they upgrade their Windows 11 21h2 PC to KB5018418, 11th Oct 2022 Security update. If you are one such user, Microsoft has released a non-security update for you KB5020387. This is basically an out-of-band update and hence it is not available under Windows Update.

You may download and install this optional update by visiting Microsoft’s Update Catalog. Installing this patch update will upgrade your OS Build to Build 22000.1100.

Note: If you are running Windows 10, version 21h2, 21h1, or 20h2, you should install KB5020435. Just like KB5020387, this update resolves network-related issues on Windows 10 all versions.

Windows 11 KB5020387 Update Changelog

This non-security update brings the following changes to your Windows 11 22h2 device –

We address an issue that might affect some types of Secure Sockets Layer (SSL) and Transport Layer Security (TLS) connections. These connections might have handshake failures. For developers, the affected connections are likely to receive one or more records followed by a partial record with a size of less than 5 bytes within a single input buffer. If the connection fails, your app will receive the error, “SEC_E_ILLEGAL_MESSAGE”.

Are there any known issues with this cumulative update?

As per Microsoft, they are not aware of any issues with this update. So, you may upgrade your system to OS Build 22000.1100.

This update requires your device to run on the Servicing Stack update 22000.1035. Worry not, as this SSU last came with September 20, 2022 update. If you have already installed this update or the Oct 2022 security update, KB5018418 on your Windows 11 22h2, you need not do anything.

Direct Download Links to KB5020387

You can’t download this update via Windows Update or WSUS. This is because it is an out-of-band update and hence it is optional in nature. Go for this patch update only if you are facing network issues on your Windows 11 PC. Here’s how to install this update on your device –

  • Visit Microsoft’s Update catalog first.
  • You will find two links, both bearing a patch to different system architectures Windows 11 supports.
  • Pick the one that matches your system configuration, and hit the Download button.


  • On the next screen, click on the top link and browse to a location where you would like to save this file.
  • After the download completes, double-click on it to begin its installation.

That’s it, your Windows 11 PC now upgrades to Build 22000.1100.

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