diff --git a/Granados/SSH2Connection.cs b/Granados/SSH2Connection.cs
index d798c3b..a42853f 100644
--- a/Granados/SSH2Connection.cs
+++ b/Granados/SSH2Connection.cs
@@ -1180,7 +1180,7 @@ namespace Granados.SSH2 {
         }

         private void SendKEXINIT(Mode mode) {
-            const string kex_algorithm = "diffie-hellman-group1-sha1";
+            const string kex_algorithm = "diffie-hellman-group14-sha1";
             const string mac_algorithm = "hmac-sha1";
             SSH2DataWriter wr = new SSH2DataWriter();
             wr.WritePacketType(PacketType.SSH_MSG_KEXINIT);
@@ -1241,7 +1241,7 @@ namespace Granados.SSH2 {

             string kex = enc.GetString(re.ReadString());
             _cInfo._supportedKEXAlgorithms = kex;
-            CheckAlgorithmSupport("keyexchange", kex, "diffie-hellman-group1-sha1");
+            CheckAlgorithmSupport("keyexchange", kex, "diffie-hellman-group14-sha1");

             string host_key = enc.GetString(re.ReadString());
             _cInfo._supportedHostKeyAlgorithms = host_key;
@@ -1533,8 +1533,13 @@ namespace Granados.SSH2 {
                     sb.Append("29024E088A67CC74020BBEA63B139B22514A08798E3404DD");
                     sb.Append("EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245");
                     sb.Append("E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED");
-                    sb.Append("EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381");
-                    sb.Append("FFFFFFFFFFFFFFFF");
+                    sb.Append("EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D");
+                    sb.Append("C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F");
+                    sb.Append("83655D23DCA3AD961C62F356208552BB9ED529077096966D");
+                    sb.Append("670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B");
+                    sb.Append("E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9");
+                    sb.Append("DE2BCBF6955817183995497CEA956AE515D2261898FA0510");
+                    sb.Append("15728E5A8AACAA68FFFFFFFFFFFFFFFF");
                     _dh_prime = new BigInteger(sb.ToString(), 16);
                 }
                 return _dh_prime;