Microsoft fixes Home windows TLS handshake failures in out-of-band updates



Microsoft has issued an out-of-band (OOB) non-security replace to handle a problem triggering SSL/TLS handshake failures on shopper and server platforms.

On affected gadgets, customers will see SEC_E_ILLEGAL_MESSAGE errors in purposes when connections to servers expertise points. 

“We deal with a problem that may have an effect on some kinds of Safe Sockets Layer (SSL) and Transport Layer Safety (TLS) connections. These connections may need handshake failures,” Microsoft explains.

“For builders, the affected connections are more likely to obtain a number of data adopted by a partial document with a dimension of lower than 5 bytes inside a single enter buffer.”

The recognized concern addressed in right now’s OOB updates impacts a number of Home windows releases and editions, together with:

  • ​Shopper: Home windows 11, model 22H2; Home windows 11, model 21H2; Home windows 10, model 21H2; Home windows 10, model 21H1; Home windows 10, model 20H2; Home windows 10 Enterprise LTSC 2019; Home windows 10 Enterprise LTSC 2016; Home windows 10 Enterprise 2015 LTSB; Home windows 8.1; Home windows 7 SP1
  • ​Server: Home windows Server 2022; Home windows Server 2019; Home windows Server 2016; Home windows Server 2012 R2; Home windows Server 2012; Home windows Server 2008 R2 SP1

Out there by way of the Microsoft Replace Catalog

The updates cannot be deployed by way of Home windows Replace, Home windows Replace for Enterprise, or Home windows Server Replace Providers (WSUS).

You may set up them by downloading from the Microsoft Replace Catalog and manually importing them into WSUS and Microsoft Endpoint Configuration Supervisor.

Microsoft has launched each standalone packages and cumulative updates:

  • Cumulative updates:
    • Home windows 11, model 21H2: KB5020387
    • Home windows Server 2022: KB5020436
    • Home windows 10, model 20H2; Home windows 10, model 21H1; Home windows 10, model 22H1; Home windows 10 Enterprise LTSC 2021: KB5020435
    • Home windows 10 Enterprise LTSC 2019; Home windows Server 2019: KB5020438
  • Standalone Updates:

The corporate continues to be engaged on a repair for Home windows 10 2016 LTSB, Home windows Server 2016, and Home windows 10 2015 LTSB.

After deploying the replace, the Cluster Service would possibly fail to begin as a result of a Cluster Community Driver isn’t discovered attributable to an replace to the PnP class drivers utilized by the service.

Final month, Microsoft stated that it by accident listed the September Home windows preview replace in Home windows Server Replace Providers (WSUS).

Redmond added that till the replace was faraway from WSUS, it might nonetheless result in safety replace set up issues in some managed environments.


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