Sign in with Microsoft
Sign in or create an account.
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.


Microsoft Lync Server 2013 provides minimal support for HTTP clients that incorrectly connect to a SIP listening port because the Lync Server uses port 443 for client connections in the service topologies. After you apply this update, the Lync Server will include a Strict-Transport-Security header in the path where it returns any HTTP response and the underlying connection is TLS.

Note HTTP Strict Transport Security (HSTS) is an Internet Engineering Task Force (IETF) standard-compliant security feature in the header to help users connect to secure sites in a secure way, and prevent some attacks.

How to get this update

To get this update, install the July 2018 cumulative update 5.0.8308.1001 for Lync Server 2013, Front End Server and Edge Server.

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Was this information helpful?

What affected your experience?

Thank you for your feedback!