* The default value of ServicePointManager.SecurityProtocol is unsecure for .net framework versions earlier than 4.7.
* The default SslProtocol for https://docs.microsoft.com/en-us/dotnet/api/system.net.security.sslstream.authenticateasclient?view=net-5.0#System_Net_Security_SslStream_AuthenticateAsClient_System_String_[SSLStream] is unsecure for framework versions earlier than 4.7
