Microsoft fixes Windows TLS handshake failures in out-of-band updates



Microsoft has issued an out-of-band (OOB) non-security update to address an issue triggering SSL/TLS handshake failures on client and server platforms.

On affected devices, users will see SEC_E_ILLEGAL_MESSAGE errors in applications when connections to servers experience issues.

“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,” Microsoft explains.

“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.”

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