How to create SSLStream which uses Ssl3 instead of Tls

问题

I'm trying to establish tcp connection which is encrypted using Ssl3.

Basically I'm just creating TCP connection and than I'm creating SSLStream on top of that:

var ss = new SslStream(poolItem.SecureConnection, false, remoteCertificateValidationCallback);

ss.ReadTimeout = ss.WriteTimeout = timeout;

ss.AuthenticateAsClient(host);

var pp = ss.SslProtocol;

My problem is that by default SslStream uses TLS. I want for it to be Ssl3.

In HttpWebRequest, you can use following code to change the protocol:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3;

I checked it, and it doesn't affect SslStream.

How do I change SslStream's protocol to Ssl3?

回答1:

You just have to use the AuthenticateAsClient overload that lets you specify which protocols should be allowed:

AuthenticateAsClient
  (host, new X509CertificateCollection(), SslProtocols.Ssl3, false);

来源：https://stackoverflow.com/questions/24676881/how-to-create-sslstream-which-uses-ssl3-instead-of-tls