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

You can override the default behavior in following registry:

Key  : HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319 
Value: SchUseStrongCrypto
Type: REG_DWORD
Data : 1

and

Key  : HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\.NETFramework\v4.0.30319
Value: SchUseStrongCrypto
Type: REG_DWORD
Data : 1

For details, please see the implementation of ServicePointManager.