**Check SSLProtocols enum usage**

[rpetrusha]

• SslProtocols.Default should not be used; it should be replaced with SslProtocols.None.
• SslProtocols.Ssl2, SslProtocols.Ssl3, and SslProtocols.Tls are all obsolete. The documentation for Tls should be added to note that it's provided for backward compatibility only.
• Use the OS default (None).
• If you have to choose one, select Tls12.