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Dynamics 365

Updates coming to Dynamics 365 Customer Engagement connection security

Starting with Dynamics 365 (online), version 9.0, connections to Customer Engagement applications are required to use TLS 1.2 (or later) security protocol. This aligns with updated Microsoft and industry security policies and best practices. To prevent any disruption to your organization, you might be required to take actions to maintain the connectivity to Dynamics 365 Customer Engagement applications.

Please review the following information to help you identify if you are impacted and what steps you may need to take.

What is TLS:

TLS stands for “Transport Layer Security,” and is a protocol that is an industry standard designed to protect the privacy of information communicated over the Internet. TLS is used in many web browsers and applications that communicate over HTTPS and TCP.

What is the change:

Today, all Dynamics 365 Customer Engagement online versions support TLS 1.0, 1.1 and 1.2, but starting with the release of Dynamics 365 (online) version 9.0, we will begin blocking connections to the updated product from clients or browsers that are using TLS 1.0 and 1.1. Versions 8.x and 7.x of Dynamics 365 Customer Engagement will not be affected with this change, and will continue to provide support for TLS 1.0, 1.1, and 1.2 as they do today. Please note: This change only affects Microsoft Dynamics 365 (online), not on-premises versions.

How will you or your customers be impacted:           

Any connections to Dynamics 365 (online), version 9.x will fail if they do not use TLS 1.2 security protocol.  This will impact several Dynamics services (listed below), including access to the Dynamics 365 Customer Engagement web application.

How you or your customers can avoid being impacted:

  1. Use supported browsersto access the Dynamics 365 web application. For help identifying if a browser supports the TLS 1.2 requirement, go to this validation test page.
  2. Recompile your custom Windows clients that were built using the .NET Framework 4.5.2 to use the .NET Framework 4.6.2 or later.
  3. Download and update your Dynamics 365 for Outlook to version
  4. Download the latest version of developer toolsfrom NuGet.
  5. Download and update your Unified Service Desk to version 3.1.0. If you want to continue to use older versions of Unified Service Desk, you must update the client desktop’s registry entries.


Additional Information:

Blog Post: Microsoft Secure Blog > TLS 1.2 support at Microsoft

Technical support documentation with additional TLS 1.2 information