diff --git a/src/NSmartProxy.Infrastructure/Extensions/StreamExtension.cs b/src/NSmartProxy.Infrastructure/Extensions/StreamExtension.cs
index c0f96df..fdf3f0a 100644
--- a/src/NSmartProxy.Infrastructure/Extensions/StreamExtension.cs
+++ b/src/NSmartProxy.Infrastructure/Extensions/StreamExtension.cs
@@ -90,7 +90,7 @@ public static Stream ProcessSSL(this Stream clientStream, X509Certificate cert)
             try
             {
                 SslStream sslStream = new SslStream(clientStream);
-                sslStream.AuthenticateAsServer(cert, false, SslProtocols.Tls, true);
+                sslStream.AuthenticateAsServer(cert, false, SslProtocols.Tls12, true);
                 sslStream.ReadTimeout = 10000;
                 sslStream.WriteTimeout = 10000;
                 return sslStream;