Microsoft O365 is moving to TLS 1.2

DMC Technology Group has shared this Office 365 message with you: 

Reminder: We are moving to TLS 1.2 for encryption

As of October 31, 2018, Microsoft Office 365 will no longer support TLS 1.0 and 1.1.

By October 31, 2018, all client-server and browser-server combinations should use TLS version 1.2 (or a later version) to ensure connection without issues to Office 365 services. This may require updates to certain client-server and browser-server combinations.

If you do not update to TLS version 1.2 (or later) by October 31, 2018, you may experience issues when connecting to Office 365. If you experience an issue related to the use of an old TLS version after October 31, 2018, you will be required to update to TLS 1.2 as part of the resolution.

What do I need to do to prepare for this change?

We recommend you take this opportunity to inventory any systems relaying email relying on the weaker TLS protocols of 1.0 and 1.1 even if you are not a customer utilizing Office 365 services as it may impact communicating to other parties who are. We also recommend you proactively address weak TLS usage by removing TLS 1.0/1.1 dependencies in your environments and disabling TLS 1.0/1.1 at the operating system level where possible. Begin planning your migration to TLS 1.2+, today. A commonly overlooked issue is network device alerting. This would include network monitoring tools, VMWare vCenter alerts, disk array alerts, printers/scanners capable of sending emails, and firewalls. The version of TLS being used is sometimes hidden in the firmware and it is not easily identified by the managing software. This could cause important alerts to be missed such as hard drive failures or other system errors.

Please click Additional Information below to learn more about Microsoft identified known problems.

Additional information

DMC can provide consulting services to help identify issues and, when possible, remediate the problem with updates or work arounds.

Close Menu