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In .NET 4.5 the System.Net.SecurityProtocolType enumeration has been extended by 2 new entries: Tls11 and Tls12.
These 2 new entries are missing in Mono (.NET 4.5 profile).
System.Net.SecurityProtocolType is mirrored in Mono.Security.Protocol.Tls.SecurityProtocolType, so some spots in Mono.Security.Protocol.Tls might possibly also be affected.
The new enum values have been added, but note that we do not support TLS 1.1 and 1.2 yet.