Microsoft KB Archive Search

Notice: This website is an unofficial Microsoft Knowledge Base (hereinafter KB) archive and is intended to provide a reliable access to deleted content from Microsoft KB. All KB articles are owned by Microsoft Corporation. Read full disclaimer for more details.

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

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

View products that this article applies to.

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.

↑ Back to the top

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.

↑ Back to the top

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.

↑ Back to the top

Status

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

↑ Back to the top

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.

↑ Back to the top

Keywords: kbqfe, kbfix, kbsurveynew, kbexpertiseadvanced, kb

↑ Back to the top

Article Info
Article ID : 3045301
Revision : 1
Created on : 1/7/2017
Published on : 3/17/2015
Exists online : False
Views : 569