Microsoft has started sending out emails to Dynamics 365 Customer Engagement customers to announce upcoming changes in the July 2017 Update and how the security of network connections is changing. The change is the version of the transport layer security, TLS, is changing to require a minimum of version 1.2, and not accept lower protocol versions anymore, including TLS 1.1 and 1.0. This requires changes to xRM Portals Community Edition (CE) to ensure compatibility.
More details about this change are in the Microsoft Dynamics 365 Team’s blog post Updates coming to Dynamics 365 Customer Engagement connection security.
The relevance of this change is that xRM Portals Community Edition (CE) is currently running on a version of the .NET Framework, 4.5.2, that doesn’t use TLS 1.2 by default when connecting to servers that require secure connections, and until the code is updated to a newer version of the .NET Framework, or extra code is added to force connections to use TLS 1.2, connectivity to Dynamics 365 CE July 2017 update will be blocked.
The plan at this stage is to upgrade xRM Portals CE to use .NET Framework 4.7. This will cause outbound network connections to use TLS 1.2 by default, and allow use with Dynamics 365 CE July 2017 Update. Work on this effort has begun and progress is being tracked in the issue Update all projects to target .NET Framework 4.7 for TLS 1.2 compatibility.
Once the .NET 4.7 upgrade has been completed and tested successfully, the change will be committed to the master branch.
Nov 11, 2017 update – this change is now complete.