Enable TLS 1.2 and disable SSL 3 on SQL Server 2008
In order to be compatible with TLS 1.2, you must be running SQL Server 2008 R2 version 10.50.6542.0 or later.

To get to that version level, you need to install Service Pack 3 for SQL Server 2008 R2, then install the hotfix from KB3144114 from https://support.microsoft.com/en-us/Hotfix/KbHotfix?kbnum=3144114&amp;kbln=en-us which will update your SQL Server to v 10.50.6542. 

Be aware, the above hotfix should never be installed on a production system unless you've extensively tested it in your test-environment first.