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Categories: Microsoft 365 Suite

March 30, 2021

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Reminder: Disabling TLS 1.0 and TLS 1.1 in Microsoft 365

QuixTec provides technical bulletins ‘unaltered’ from Microsoft. As an authorized Microsoft Partner, experienced SharePoint development group and Office 365 expert, QuixTec’s’ custom online or on premises solutions include the latest Microsoft updates throughout initiatives that we custom develop.

FROM MICROSOFT CORPORATION

Message Summary

This message post is a reminder of the ongoing progress of retiring TLS 1.0 and TLS 1.1 protocols in Microsoft 365.

As previously communicated (MC126199 in Dec 2017, MC128929 in Feb 2018, MC186827 in July 2019, and MC218794 in July 2020), we are moving all our online services to Transport Layer Security (TLS) 1.2+ to provide best in class encryption, and to ensure our services is more secure by default. The changes to enforce TLS1.2+ in our service started on October 15, 2020 and will continue to propagate through all Microsoft 365 environments for the next few months. If you have not taken steps to prepare for this change, your connectivity to Microsoft 365 might be impacted.

Note: If your organization has already taken steps to migrate from TLS 1.0 and 1.1, you can safely disregard this message

Key Points:

  • Major: Retirement of TLS1.0/1.1 protocols. All requests with TLS1.0/1.1 to Microsoft 365 will no longer work.
  • Timing: Started October 15, 2020
  • Action: update or replace client devices as appropriate

How this affects your organization:

Once this change takes effect, all connections to Microsoft 365 using the protocols TLS 1.0 and TLS 1.1 will no longer work. In addition, .NET applications executed using the .NET 4.5 runtime are a common set of applications that are impacted as .NET 4.5 defaults to TLS 1.1, however any application that calls into Microsoft 365 API’s using TLS 1.0 or TLS 1.1 will be impacted.

What you should do to prepare:

Update or replace clients and devices that rely on TLS 1.0 and 1.1 to connect to Microsoft 365.

Update and configure the .NET Framework to support TLS 1.2+.

Additional information

QuixTec, LLC is a U.S. certified Veteran Owned, modern DevOps organization and Microsoft Partner that specializes in Microsoft SharePoint, Office 365 expertise & HTML5 technologies for small to enterprise-sized organizations. The founder, Richard, has 30 years of experience working with several notable companies that include World Vision, Expedia, Microsoft, Levi Strauss, NASA, Boeing Aerospace, Los Alamos National Laboratory and the U.S. Air Force, to name a few. QuixTec is located in the Seattle area. Phone today for a free consultation and project estimate: (425) 367-9025 SHAREPOINT DEVELOPMENT – CUSTOM SOFTWARE DEVELOPMENT – OFFICE 365 EXPERTS – SHAREPOINT DOCUMENT LIBRARIES – SHAREPOINT CONUSLTANCY – CUSTOM SOLUTION DEVELOPMENT

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