Unable to establish connection to 127.0.0.1:port using SimpleTcpClient in C#

I am trying to create a TCP server in C# using the SimpleTCP 1.0.24 library. However, when I try to connect to the local address 127.0.0.1 and port 51947, I get the following error message:

Unable to establish connection. Persistent refusal of the destination computer. [::ffff:127.0.0.1]:51947

Here’s the code I’m using:

using (var client = new SimpleTcpClient()) {
    client.StringEncoder = Encoding.UTF8;
    client.DataReceived += (sender, message) => Console.WriteLine("Message Received");
    client.Connect("127.0.0.1", 51947);
    ...
}

Can someone help me understand what’s causing this error and how I can establish a connection to my local TCP server?

>Solution :

The error message you’re seeing indicates that the connection was actively refused by the destination computer, which is typically caused by a port being closed or inaccessible. Here are a few things you can try to resolve the issue :

• Make sure that your server is actually listening on the specified port (51947). You can check this by using a tool like netstat or TCPView to see if there are any active TCP connections on that port.

• Check if there’s any firewall or antivirus software running that might be blocking the connection. Try temporarily disabling them to see if that resolves the issue.

• Try connecting to a different port on the same machine to see if the problem is specific to that port.

• Verify that the IP address you’re using is correct. You can check this by running the ipconfig command in a command prompt and looking for the IPv4 address of the interface you’re using.

If none of these solutions work, you may want to consider using a different TCP library or troubleshooting further to identify the root cause of the problem.