WebSocket.NoSilverlight.cs v0.15 forces usage of insecure SslProtocols.Default

[maxmeffert]

Hi, we just found that in v0.15 WebSocket.NoSilverlight.cs forces the usage of SslProtocols.Default for non .NET Core applications, limiting the operating system to choose between SSL3 und TLS1.0 which poses a potential security risk.

The recommendation is to use SslProtocols.None leaving the choice completely to the operating system.

• https://docs.microsoft.com/en-us/dotnet/framework/network-programming/tls
• https://docs.microsoft.com/en-us/dotnet/api/system.security.authentication.sslprotocols?view=net-5.0

[kerryjiang]

Please try WebSocket4Net 1.0.0-beta.2. https://www.nuget.org/packages/WebSocket4Net/1.0.0-beta.2