@TimRice - I believe you may need .Net 4.5 installed on your server to support the TLS 1.2 communications. I’m curious to know if you have Enhanced Security enabled – it appears .Net 4.0 supports TLS 1.0 but you need .Net 4.5 to support TLS 1.2x
Fixlet 285872501, “2858725: Microsoft .NET Framework 4.5.1 Available - Windows 7 SP1 / Windows 8 Gold / Windows 2008 R2 SP1 / Windows 2008 SP2 / Windows 2012 Gold / Windows Vista SP2 (x64)” in the, “Patches for Windows” site should be able to help you meet this requirement.
Once you have that installed it should work – let me know if it doesn’t resolve your issue.