What is TLS?
Transport Layer Security (TLS) is an industry standard to help protect information communicated over the internet. The newest version TLS, 1.2 provides improved security and is the current standard.
What is changing?
For Office 365 users Microsoft will discontinue support for TLS 1.0 and 1.1 on October 31 2018. This means that if you have not enabled TLS 1.2 by the end of October you may experience connectivity issues to 365.
What is affected?
If your environment is using Office 365 then TLS 1.0/1.1 can remain enabled, however to avoid any interruptions TLS 1.2 must be enabled for Office 365. Older web browsers will need to support TLS 1.2, if by chance you are using an older web browser, it will be worth upgrading to a later release.
The following clients are known to be unable to use TLS 1.2.
Android 4.3 and earlier versions
Firefox version 5.0 and earlier versions
Internet Explorer 8-10 on Windows 7 and earlier versions
Internet Explorer 10 on Win Phone 8.0
Safari 6.0.4/OS X10.8.4 and earlier versions
Servers such as Exchange, Windows & SharePoint will need to have TLS 1.2 enabled. In a Hybrid scenario, such as on-premises Active Directory Federation Services need to make sure that the infrastructure can support both inbound and outbound connections using TLS 1.2. Further to this, other scenarios should be considered to ensure that there are no issues once older versions are no longer supported.
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