Nostale packet to official server problem

 string packet = "NoS0575 6322112 USERNAME 109177246F927042641467C191156B736755635463B13583345 00332B980.9.3.3055 0 B5D5C01C083E1F954259316FE2206F9D";
            byte[] bytesToSend = Cryptography.EncryptLogin(packet);
            Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, 0);
 s.Connect(SERVER_IP, PORT_NO);
            byte[] bytes = new byte[bytesToSend.Length];
            s.Send(bytesToSend, bytesToSend.Length, SocketFlags.None);
            
            s.Receive(bytes, bytesToSend.Length, SocketFlags.None);
            string decrypted = Cryptography.DecryptLogin(bytes, bytesToSend.Length);
            Console.WriteLine(decrypted);

public static string DecryptLogin(byte[] bytes, int length)
        {

            for (int i = 0; i <= length - 1; i++)
            {
                try
                {
                    bytes[i] = Convert.ToByte(bytes[i] - 15);
                }
                catch (Exception ex)
                {
                    bytes[i] = Convert.ToByte((bytes[i] - 15) + 256);
                }

            }
            return System.Text.Encoding.UTF8.GetString(bytes).Substring(0, length);
        }
 public static byte[] EncryptLogin(string packet)
        {
            string str_enc = "";

            for (int i = 0; i < packet.Length; i++)
            {

                str_enc += chr((ord(packet[i].ToString()) ^ 195) + 15);
            }
            str_enc += ((byte)216).ToString();
            return StringToByte(str_enc += chr(216));

        }
public string EncryptPassword(string password) //I don't use this func at the moment.
        {
            Random rnd = new Random();
            string str_hex = ToHex(password).ToUpper();

            int pos = rnd.Next(0, 22);

            byte[] secondtable = { 46, 42, 23, 79, 32, 36, 71, 17, 91, 55, 83, 67, 21, 52, 69, 37, 75, 29, 47, 88, 43, 50, 99 };
            string pw_enc = ToHex(chr(secondtable[pos]).ToString()).ToUpper();
            for (int i = 0; i < str_hex.Length; i += 2)
            {
                pw_enc += ToHex((chr((secondtable[pos] & 240) / 16))).ToUpper();
                pw_enc += str_hex[i];
                pw_enc += ToHex((chr(secondtable[pos] & 15)).ToString()).ToUpper();
                pw_enc += str_hex[i + 1];

                if (pos == 22) { pos = 0; }
                else { pos++; }
            }
            return pw_enc;
        }