Tcp server problem with random connections

See more:

C#

networking

sockets

TcpClient

, +

look i am trying to make a TCP server for a private chatroom with AES encryption.
but the problem i am facing is that when one client joins it works fine. but when two join it become odd like a new client would join even tho they are only two clients connected. i have been trying to fix this but with no luck. also it never sends the message to the client

I beleave the problem is with is function

public static void Brodcast_Message(TcpClient tcp, string message)
        {
            for(int i = 0; i < clients.Count; i++)
            {
                if(tcp != clients[i])
                {
                    Console.WriteLine(clients[i].Connected);
                    if (clients[i].Connected)
                    {
                        byte[] buffer = Encoding.ASCII.GetBytes(message);
                        Stream stream = clients[i].GetStream();
                        stream.Write(buffer, 0, buffer.Length);
                        stream.Flush();
                        Console.WriteLine($"Send Message: {message}");
                    }
                    else
                    {
                        clients.RemoveAt(i);
                        threads[i].Abort();
                        threads.RemoveAt(i);
                        Console.WriteLine("Client Disconnected");
                    }
                }
            }
        }

this is what "threads" and "clients" are

public static List<TcpClient> clients = new List<TcpClient>();
public static List<Thread> threads = new List<Thread>();

this is the client thread

public static void Client_Thread(TcpClient client)
        {
            bool exit = true;
            while (exit)
            {
                try
                {
                    byte[] buffer = new byte[500];
                    Stream stream = client.GetStream();
                    stream.Read(buffer, 0, buffer.Length);
                    string messsage = Encoding.ASCII.GetString(buffer).Replace("\0", "");
                    if (!String.IsNullOrEmpty(messsage))
                    {
                        Console.WriteLine($"MSG: {messsage}");
                        Brodcast_Message(client, messsage);
                    }
                }
                catch (Exception) { exit = false; }
            }
        }

this is the starting point

static void Main(string[] args)
        {
            listener.Start(100);
            while (true)
            {
                TcpClient client = listener.AcceptTcpClient();
                Thread thread = new Thread(() => Client_Thread(client));
                clients.Add(client);
                threads.Add(thread);
                Console.WriteLine("Client Connected");
                thread.Start();
            }
        }

as for the client

public static void Server_Thread(ListBox Users, ListBox Messages)
        {
            while (true)
            {
                try
                {
                    client = new TcpClient("127.0.0.1", 2355);
                    while (true)
                    {
                        Stream sw = client.GetStream();
                        byte[] buffer = new byte[500];
                        sw.Read(buffer, 0, buffer.Length);
                        string encoded_data = Decrypt(Encoding.ASCII.GetString(buffer), "YOUR_PASSWORD");
                        MessageBox.Show(encoded_data);
                        string[] data = encoded_data.Split(':');
                        if (!String.IsNullOrEmpty(encoded_data))
                        {
                            if (!User_Check(data[0], Users))
                            {
                                Users.Invoke((MethodInvoker)delegate { Users.Items.Add(data[0]); });
                            }
                            else if (data[0] == "SYSTEM")
                            {
                                Users.Invoke((MethodInvoker)delegate { Users.Items.Remove(data[1]); });
                            }
                            else
                            {
                                Messages.Invoke((MethodInvoker)delegate { Messages.Items.Add($"{data[0]} >> {data[1]}"); });
                            }
                        }
                    }
                }
                catch (Exception) { }
            }
        }

What I have tried:

i have tried googling and i have tired changing some of the functions but again with no luck. if you know the how to fix this problem i would very much like to know. anyway i have changing code on the client and the server and with no provail.