Default SecurityProtocol in .NET 4.5

Question

What is the default security protocol for communicating with servers that support up to TLS 1.2? Will .NET by default, choose the highest security

Answer 1

If you can use .NET 4.7.1 or newer, it will use TLS 1.2 as the minimum protocol based on the operating system capabilities. Per Microsoft recommendation :

To ensure .NET Framework applications remain secure, the TLS version should not be hardcoded. .NET Framework applications should use the TLS version the operating system (OS) supports.