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Message: <blockquote data-quote="RoChess" data-source="post: 1263526" data-attributes="member: 18896">Keep in mind that 0xc00 is only needed on .NET 4.0, and that in .NET 4.5 you can refer to it as Tls12, which in .NET 4.6.2+ is made default now (or .NET Core).Problem is that when you use = and not |= that you kill off TLS 1.0 and 1.1 support, which some servers still require if they are not configured to handle TLS 1.2-Only connections. Otherwise Forward-Secrecy is not used and then connection is sometimes killed off.</blockquote>[/QUOTE]