The solution to this, in .NET 4.55+ is
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; If you don’t have .NET 4.5 then use
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072; Find centralized, trusted content and collaborate around the technologies you use most.
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Explore Stack InternalThe solution to this, in .NET 4.55+ is
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; If you don’t have .NET 4.5 then use
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072; The solution to this, in .NET 4.5 is
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; If you don’t have .NET 4.5 then use
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072; The solution to this, in .NET 4.5+ is
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12; If you don’t have .NET 4.5 then use
ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072; 
