Microsoft has released cumulative preview update KB5018496 to fix a TLS handshake failure issue for both client and server platforms .
See also: Microsoft fixes TLS handshake failures in out-of-band updates
This month's Patch Tuesday Windows security updates caused an issue, which has already been fixed for systems running Windows 11 22H2.
If you're using Windows 11 and are having trouble connecting to servers, you may see SEC_E_ILLEGAL_MESSAGE in apps .
As Microsoft stated, “We have addressed an issue that may cause some Secure Sockets Layer (SSL) and Transport Layer Security (TLS) connections to fail during the handshake process.”
Unlike other updates, KB5018496 is optional and only installed if you choose to install it. This update does not include security fixes.
To install it on device , go to Settings > Windows Update and tap Check for Updates , then select the optional preview to download and install.
See also: Chrome: Support for Windows 7 and 8.1 will end soon
In addition to out-of-band releases, Microsoft has also released standalone packages and cumulative updates for older versions of Windows.
- Cumulative updates:
- Windows 11, version 21H2: KB5020387
- Windows Server 2022: KB5020436
- Windows 10, version 20H2; Windows 10, version 21H1; Windows 10, version 22H1; Windows 10 Enterprise LTSC 2021: KB5020435
- Windows 10 Enterprise LTSC 2019? Windows Server 2019: KB5020438
- Windows 10 2016 LTSB? Windows Server 2016: KB5020439
- Windows 10 2015 LTSB? KB5020440
- Standalone Updates:
- Windows 8.1? Windows Server 2012 R2: KB5020447
- Windows Server 2012: KB5020449
- Windows 7 SP1? Windows Server 2008 R2 SP1: KB5020448
You cannot install these updates through Windows Update, Windows Update for Business, or Windows Server Update Services (WSUS).
See also: Microsoft fixes bug that prevents Windows 11 22H2 updates
To install the updates, first download them from the Microsoft Update Catalog. After downloading them, import them into WSUS and Microsoft Endpoint Configuration Manager.
The full list of fixes and improvements included in update KB5018496 can be found in this support bulletin.
