Unable to connect electric smart meter.(aarq request failed)

GXDLMSSecureClient sclient = new GXDLMSSecureClient();
GXNet gXNet = new GXNet(NetworkType.Tcp, "ip address", 4059);
sclient.UseLogicalNameReferencing = true;

// Is used HDLC or COSEM transport layers for IPv4 networks (IEC 62056-47)
sclient.InterfaceType = InterfaceType.WRAPPER;
sclient.ClientAddress = 32;
sclient.ServerAddress = 1;
sclient.Authentication = Authentication.Low;
sclient.Password = ASCIIEncoding.ASCII.GetBytes("123456");
sclient.Ciphering.SecuritySuite = SecuritySuite.Suite0;
sclient.Ciphering.Security = Security.AuthenticationEncryption;

sclient.Ciphering.SystemTitle = GXCommon.HexToBytes("7177657274797569");

sclient.Ciphering.BlockCipherKey = GXCommon.HexToBytes("62626262626262626262626262626262");
sclient.Ciphering.AuthenticationKey = GXCommon.HexToBytes("62626262626262626262626262626262");
sclient.Ciphering.Signing = Signing.None;

Media = gXNet as IGXMedia;
Media.Open();

GXReplyData reply = new GXReplyData();
byte[] data;
data = sclient.SNRMRequest();
if (data != null)
{
ReadDLMSPacket(data, reply);
sclient.ParseUAResponse(reply.Data);
}
//Generate AARQ request.
//Split requests to multiple packets if needed.
//If password is used all data might not fit to one packet.
foreach (byte[] it in sclient.AARQRequest())
{
Console.WriteLine("Send AARQ request-{0}", GXCommon.ToHex(it, true));
reply.Clear();
reply = ReadDLMSPacket(it, reply);
}

//Parse reply.
sclient.ParseAAREResponse(reply.Data);
Console.WriteLine("Conformance: " + sclient.NegotiatedConformance);
Console.WriteLine(sclient.ConnectionState);

byte[][] obj = sclient.Read("0.0.42.0.0.255", ObjectType.Data, 2);
/// Read Association View from the meter.
reply = new GXReplyData();
ReadDataBlock(obj, reply);

public static GXReplyData ReadDLMSPacket(byte[] data, GXReplyData reply)
{
if (data == null)
{
return reply;
}
object eop = (byte)0x7E;
//In network connection terminator is not used.

int pos = 0;
bool succeeded = false;
ReceiveParameters<byte[]> p = new ReceiveParameters<byte[]>()
{
AllData = true,
Eop = eop,
Count = 5,
WaitTime = 5000,
};
lock (Media.Synchronous)
{
while (!succeeded && pos != 3)
{
Media.Send(data, null);
succeeded = Media.Receive(p);
Console.WriteLine("Response-{0}", GXCommon.ToHex(p.Reply, true));
if (!succeeded)
{
//If Eop is not set read one byte at time.
if (p.Eop == null)
{
p.Count = 1;
}
//Try to read again...
if (++pos != 3)
{
System.Diagnostics.Debug.WriteLine("Data send failed. Try to resend " + pos.ToString() + "/3");
continue;
}
throw new Exception("Failed to receive reply from the device in given time.");
}
}
//Loop until whole COSEM packet is received.
while (!client.GetData(p.Reply, reply))
{
//If Eop is not set read one byte at time.
if (p.Eop == null)
{
p.Count = 1;
}
if (!Media.Receive(p))
{
//Try to read again...
if (pos != 3)
{
System.Diagnostics.Debug.WriteLine("Data send failed. Try to resend " + pos.ToString() + "/3");
continue;
}
throw new Exception("Failed to receive reply from the device in given time.");
}
}
}
if (reply.Error != 0)
{
throw new GXDLMSException(reply.Error);
}

return reply;
}