diff --git a/lib/csharp/src/Transport/TTLSServerSocket.cs b/lib/csharp/src/Transport/TTLSServerSocket.cs
index 631a593..99f21ca 100644
--- a/lib/csharp/src/Transport/TTLSServerSocket.cs
+++ b/lib/csharp/src/Transport/TTLSServerSocket.cs
@@ -20,6 +20,7 @@
 using System;
 using System.Net.Security;
 using System.Net.Sockets;
+using System.Security.Authentication;
 using System.Security.Cryptography.X509Certificates;
 
 namespace Thrift.Transport
@@ -65,6 +66,11 @@
         private LocalCertificateSelectionCallback localCertificateSelectionCallback;
 
         /// <summary>
+        /// The SslProtocols value that represents the protocol used for authentication.
+        /// </summary>
+        private readonly SslProtocols sslProtocols;
+
+        /// <summary>
         /// Initializes a new instance of the <see cref="TTLSServerSocket" /> class.
         /// </summary>
         /// <param name="port">The port where the server runs.</param>
@@ -94,13 +100,16 @@
         /// <param name="certificate">The certificate object.</param>
         /// <param name="clientCertValidator">The certificate validator.</param>
         /// <param name="localCertificateSelectionCallback">The callback to select which certificate to use.</param>
+        /// <param name="sslProtocols">The SslProtocols value that represents the protocol used for authentication.</param>
         public TTLSServerSocket(
             int port,
             int clientTimeout,
             bool useBufferedSockets,
             X509Certificate2 certificate,
             RemoteCertificateValidationCallback clientCertValidator = null,
-            LocalCertificateSelectionCallback localCertificateSelectionCallback = null)
+            LocalCertificateSelectionCallback localCertificateSelectionCallback = null,
+            // TODO: Enable Tls1 and Tls2 (TLS 1.1 and 1.2) by default once we start using .NET 4.5+.
+            SslProtocols sslProtocols = SslProtocols.Tls)
         {
             if (!certificate.HasPrivateKey)
             {
@@ -112,6 +121,7 @@
             this.useBufferedSockets = useBufferedSockets;
             this.clientCertValidator = clientCertValidator;
             this.localCertificateSelectionCallback = localCertificateSelectionCallback;
+            this.sslProtocols = sslProtocols;
             try
             {
                 // Create server socket
@@ -168,8 +178,8 @@
                     this.serverCertificate,
                     true,
                     this.clientCertValidator,
-                    this.localCertificateSelectionCallback
-                );
+                    this.localCertificateSelectionCallback,
+                    this.sslProtocols);
 
                 socket.setupTLS();
 
diff --git a/lib/csharp/src/Transport/TTLSSocket.cs b/lib/csharp/src/Transport/TTLSSocket.cs
index 2be7a41..08f0215 100644
--- a/lib/csharp/src/Transport/TTLSSocket.cs
+++ b/lib/csharp/src/Transport/TTLSSocket.cs
@@ -77,6 +77,11 @@
         private LocalCertificateSelectionCallback localCertificateSelectionCallback;
 
         /// <summary>
+        /// The SslProtocols value that represents the protocol used for authentication.SSL protocols to be used.
+        /// </summary>
+        private readonly SslProtocols sslProtocols;
+
+        /// <summary>
         /// Initializes a new instance of the <see cref="TTLSSocket"/> class.
         /// </summary>
         /// <param name="client">An already created TCP-client</param>
@@ -84,17 +89,21 @@
         /// <param name="isServer">if set to <c>true</c> [is server].</param>
         /// <param name="certValidator">User defined cert validator.</param>
         /// <param name="localCertificateSelectionCallback">The callback to select which certificate to use.</param>
+        /// <param name="sslProtocols">The SslProtocols value that represents the protocol used for authentication.</param>
         public TTLSSocket(
             TcpClient client,
             X509Certificate certificate,
             bool isServer = false,
             RemoteCertificateValidationCallback certValidator = null,
-            LocalCertificateSelectionCallback localCertificateSelectionCallback = null)
+            LocalCertificateSelectionCallback localCertificateSelectionCallback = null,
+            // TODO: Enable Tls11 and Tls12 (TLS 1.1 and 1.2) by default once we start using .NET 4.5+.
+            SslProtocols sslProtocols = SslProtocols.Tls)
         {
             this.client = client;
             this.certificate = certificate;
             this.certValidator = certValidator;
             this.localCertificateSelectionCallback = localCertificateSelectionCallback;
+            this.sslProtocols = sslProtocols;
             this.isServer = isServer;
             if (isServer && certificate == null)
             {
@@ -116,13 +125,15 @@
         /// <param name="certificatePath">The certificate path.</param>
         /// <param name="certValidator">User defined cert validator.</param>
         /// <param name="localCertificateSelectionCallback">The callback to select which certificate to use.</param>
+        /// <param name="sslProtocols">The SslProtocols value that represents the protocol used for authentication.</param>
         public TTLSSocket(
             string host,
             int port,
             string certificatePath,
             RemoteCertificateValidationCallback certValidator = null,
-            LocalCertificateSelectionCallback localCertificateSelectionCallback = null)
-            : this(host, port, 0, X509Certificate.CreateFromCertFile(certificatePath), certValidator, localCertificateSelectionCallback)
+            LocalCertificateSelectionCallback localCertificateSelectionCallback = null,
+            SslProtocols sslProtocols = SslProtocols.Tls)
+            : this(host, port, 0, X509Certificate.CreateFromCertFile(certificatePath), certValidator, localCertificateSelectionCallback, sslProtocols)
         {
         }
 
@@ -134,13 +145,15 @@
         /// <param name="certificate">The certificate.</param>
         /// <param name="certValidator">User defined cert validator.</param>
         /// <param name="localCertificateSelectionCallback">The callback to select which certificate to use.</param>
+        /// <param name="sslProtocols">The SslProtocols value that represents the protocol used for authentication.</param>
         public TTLSSocket(
             string host,
             int port,
             X509Certificate certificate = null,
             RemoteCertificateValidationCallback certValidator = null,
-            LocalCertificateSelectionCallback localCertificateSelectionCallback = null)
-            : this(host, port, 0, certificate, certValidator, localCertificateSelectionCallback)
+            LocalCertificateSelectionCallback localCertificateSelectionCallback = null,
+            SslProtocols sslProtocols = SslProtocols.Tls)
+            : this(host, port, 0, certificate, certValidator, localCertificateSelectionCallback, sslProtocols)
         {
         }
 
@@ -153,13 +166,15 @@
         /// <param name="certificate">The certificate.</param>
         /// <param name="certValidator">User defined cert validator.</param>
         /// <param name="localCertificateSelectionCallback">The callback to select which certificate to use.</param>
+        /// <param name="sslProtocols">The SslProtocols value that represents the protocol used for authentication.</param>
         public TTLSSocket(
             string host,
             int port,
             int timeout,
             X509Certificate certificate,
             RemoteCertificateValidationCallback certValidator = null,
-            LocalCertificateSelectionCallback localCertificateSelectionCallback = null)
+            LocalCertificateSelectionCallback localCertificateSelectionCallback = null,
+            SslProtocols sslProtocols = SslProtocols.Tls)
         {
             this.host = host;
             this.port = port;
@@ -167,6 +182,7 @@
             this.certificate = certificate;
             this.certValidator = certValidator;
             this.localCertificateSelectionCallback = localCertificateSelectionCallback;
+            this.sslProtocols = sslProtocols;
 
             InitSocket();
         }
@@ -314,13 +330,13 @@
                 if (isServer)
                 {
                     // Server authentication
-                    this.secureStream.AuthenticateAsServer(this.certificate, this.certValidator != null, SslProtocols.Tls, true);
+                    this.secureStream.AuthenticateAsServer(this.certificate, this.certValidator != null, sslProtocols, true);
                 }
                 else
                 {
                     // Client authentication
                     X509CertificateCollection certs = certificate != null ?  new X509CertificateCollection { certificate } : new X509CertificateCollection();
-                    this.secureStream.AuthenticateAsClient(host, certs, SslProtocols.Tls, true);
+                    this.secureStream.AuthenticateAsClient(host, certs, sslProtocols, true);
                 }
             }
             catch (Exception)
diff --git a/lib/csharp/test/ThriftTest/TestClient.cs b/lib/csharp/test/ThriftTest/TestClient.cs
index 4c42ef7..cb73597 100644
--- a/lib/csharp/test/ThriftTest/TestClient.cs
+++ b/lib/csharp/test/ThriftTest/TestClient.cs
@@ -27,6 +27,7 @@
 using Thrift.Protocol;
 using Thrift.Transport;
 using Thrift.Test;
+using System.Security.Authentication;
 
 namespace Test
 {
@@ -60,7 +61,7 @@
                         {
                             string certPath = "../../../../test/keys/client.p12";
                             X509Certificate cert = new X509Certificate2(certPath, "thrift");
-                            trans = new TTLSSocket(host, port, cert, (o, c, chain, errors) => true);
+                            trans = new TTLSSocket(host, port, 0, cert, (o, c, chain, errors) => true, null, SslProtocols.Tls);
                         }
                         else
                         {
diff --git a/lib/csharp/test/ThriftTest/TestServer.cs b/lib/csharp/test/ThriftTest/TestServer.cs
index 4c8fc3b..e51ae92 100644
--- a/lib/csharp/test/ThriftTest/TestServer.cs
+++ b/lib/csharp/test/ThriftTest/TestServer.cs
@@ -32,6 +32,7 @@
 using Thrift;
 using System.Threading;
 using System.Text;
+using System.Security.Authentication;
 
 namespace Test
 {
@@ -468,7 +469,7 @@
                     if (useEncryption)
                     {
                         string certPath = "../../../../test/keys/server.p12";
-                        trans = new TTLSServerSocket(port, 0, useBufferedSockets, new X509Certificate2(certPath, "thrift"));
+                        trans = new TTLSServerSocket(port, 0, useBufferedSockets, new X509Certificate2(certPath, "thrift"), null, null, SslProtocols.Tls);
                     }
                     else
                     {