Agile Central - Custom Apps: TLS 1.0 and 1.1 deprecation breaks custom .NET app connection to Agile Central

Document ID : KB000097274
Last Modified Date : 21/05/2018
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Issue:
In testing to prepare for the deprecation of support for TLS 1.0 and 1.1, found that a custom application that was created using the Rally Rest API DLL for .NET, version 2.0.1.0 failed to connect to CA Agile Central. 
Resolution:
Upgrade to Rest API .NET 3.3.1 located here: https://github.com/RallyTools/RallyRestToolkitFor.NET/releases.

Alternatively can make a code change like the one referenced here: https://github.com/RallyTools/RallyRestToolkitFor.NET/blob/d6c2f58781eddf986a17d7b016ac397921ac39ce/Rally.RestApi/RallyRestApi.cs#L1426
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;
^^ That line is basically the fix.
Additional Information: