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I need to connect to a server using only one cipher - "ADH-RC4-MD5". I'm looking for a generic solution which will enable me to check what cipher the server is using (I'm a provisioning server that acts as a client to many other application servers and need to connect and get data - each time it can be a different server). The flow I had so far was: TcpClient tcpClient = new TcpClient(serverName, port); SslStream sslStream = new SslStream(tcpClient.GetStream(), false, null, null, EncryptionPolicy.RequireEncryption); sslStream.AuthenticateAsClient(HostName); I keep on crash in the AuthenticateAsClient . The reason is that one AS is working only with the mentioned cipher. I have verified this is the case with the SslScan tool . I have tried to enter this cipher through the policy editor (gpedit.msc in the command line) but again with no luck. Basically I'm looking for a way to use this cipher from code dynamically. I have a working Java code: sslsocket.setNeedClientAuth(true); String[] list = new String[1]; list[0] = "ADH-RC4-MD5"; sslsocket.setEnabledCipherSuites(list); Any idea of c# equivalent ?

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