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SMTP is not transported over TLS 1.1 or TLS 1.2 protocol in an Exchange Server 2013 environment

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Symptoms

Simple mail transfer protocol (SMTP) uses transport layer security (TLS) 1.0 in a Microsoft Exchange Server 2013 environment, even if you have enabled TLS 1.1 or TLS 1.2.

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Cause

This issue occurs because of a hard-coded restriction that limits SMTP to use secure sockets layer (SSL) 3.0 and TLS 1.0 for transport.

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Resolution

To resolve this issue, install the following cumulative update:
Cumulative Update 8 for Exchange Server 2013
Note This update removes the hard-coded restriction so that SMTP sessions can negotiate with any SSL or TLS protocols that are enabled in the host operating system.

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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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More Information

For more information about TLS and SSL protocols, see What is TLS/SSL.
For more information about how to enable TLS 1.2 protocol in registry key, see TLS/SSL Settings.

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Keywords: kbqfe, kbfix, kbsurveynew, kbexpertiseadvanced, kb

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Article Info
Article ID : 3045301
Revision : 1
Created on : 1/7/2017
Published on : 3/17/2015
Exists online : False
Views : 568