I went through the document and didn’t find any thing related to TLS 1.2.
My concern is whether DNA supports TLS1.2 or not?
Have you audited Windows OS for TLS 1.2 also SQL Servers versions for TLS 1.2 support?
https://support.microsoft.com/en-us/help/3135244/tls-1-2-support-for-microsoft-sql-server
The current version of DNA implements SQL Server Native Client 11.0 client which is a minimum requirement for TLS 1.2
Contact Microsoft Windows / SQL Server Technical Support http://microsoft.com/contactus/ for more information on issues when enabling TLS 1.2 .
