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MC240160 – (Updated) Reminder: Disabling TLS 1.0 and TLS 1.1 in Microsoft 365 (archived)

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*For this entry exists the more relevant or more recent entry MC365114

check before: 2021-03-02

Product:

Microsoft 365 suite, Office 365 general, OneDrive, SharePoint, Windows

Platform:

Mac, Online, US Instances, Web, Windows Desktop, World tenant

Status:

Change type:

Admin impact, Retirement, Updated message, User impact

Details:

Updated May 12, 2021: We have updated this post with additional details and resources.
In the upcoming days, we will be completing the changes to disable TLS1.0/1.1 protocols for OneDrive and SharePoint in M365 as we have previously communicated via multiple Message Center posts. If you experience any of the following error messages, It might be related to this change. Please take immediate action to complete the remediation steps as soon as possible to avoid usage interruption. Here is a list of common error codes likely caused by incomplete remediation to prepare for the TLS enforcement change.
Window 7 and Window 8 Machine or Window 2018 server OneDrive Sync Client error: 0x8004de40 when log in or try to connect via OneDrive. Error Code: 0x8004deb4 when signing in to OneDrive and Authentication errors when connecting to SharePoint or OneDrive from Windows 8 or 7
Application error: System.Net.WebException: The underlying connection was closed: Preparing for TLS 1.2 in Office 365 and Office 365 GCC
An existing connection was forcibly closed by the remote host: Preparing for TLS 1.2 in Office 365 and Office 365 GCC
Connection disconnected: Unexpected error occurred when sending: Preparing for TLS 1.2 in Office 365 and Office 365 GCC
Token request failed: Authentication errors occur when client doesn't have TLS 1.2 support
Authentication error: Authentication errors occur when client doesn't have TLS 1.2 support
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

Change Category:
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Scope:
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Release Phase:

Created:
2021-02-17

updated:
2021-07-08

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Last updated 11 months ago

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