How to fixbThe requested address is not valid in its context

Question

How to fixbThe requested address is not valid in its context

Al 20

I am using .net 5. I am trying to establish a connection via a Socket in corporate network. But on connect there is an Exception with a topic header message. There is no nslookup for a server ip, and httpclient sent same request successfully, but need to use Tcp. I found several solutions over network https://www.techinpost.com/the-requested-address-is-not-valid-in-its-context/ but I could not say the it is applicable to my situation, because I do not know that and prefer to save my office pc solid.

Anonymous

2023-10-25T09:44:18.3666667+00:00

Hi @Al , Welcome to Microsoft Q&A,

Please provide more information, what code are you currently using?

Add reproducible c# code.
Al 20 Reputation points

2023-10-25T10:49:17.6533333+00:00
Hi! I am using shared code https://stackoverflow.com/a/35533927/2208894

What going wrong?

After changing preamble Wireshark says that there is Http 200 OK received but program freezes at line

await stream.CopyToAsync(memory);

I have changed preamble to this one by Richard Blum

Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("1.2.3.4"),1234); sock.Connect(ipep); var stream = new NetworkStream(sock);

Hui Liu-MSFT 48,681 Microsoft External Staff

Hi,@ Al. Welcome to Microsoft Q&A Forum.

What is the type of your project? Not sure the specific cause of the problem.

The freezing issue in your code might be related to not properly handling the end of the HTTP response. You could try to modify your code to handle the end of the response correctly and ensure that you close the connection after reading the response.

private static async Task<string> HttpRequestAsync()
{
    string result = string.Empty;

    using (var tcp = new TcpClient("www.bing.com", 80))
    using (var stream = tcp.GetStream())
    {
        tcp.SendTimeout = 500;
        tcp.ReceiveTimeout = 1000;

        // Send request headers
        var builder = new StringBuilder();
        builder.AppendLine("GET /?scope=images&nr=1 HTTP/1.1");
        builder.AppendLine("Host: www.bing.com");
        builder.AppendLine("Connection: close"); // Ensure the connection is closed after the response
        builder.AppendLine();
        var header = Encoding.ASCII.GetBytes(builder.ToString());
        await stream.WriteAsync(header, 0, header.Length);

        // Receive data
        using (var memory = new MemoryStream())
        {
            await stream.CopyToAsync(memory);

            // Ensure the end of the stream is reached before processing the response
            while (stream.DataAvailable)
            {
                await stream.CopyToAsync(memory);
            }

            memory.Position = 0;
            var data = memory.ToArray();

            // Rest of your code...
        }

        return result;
    }
}

If you still have questions, please feel free to let me know. The problem will be better solved if more details are described (steps, error messages, and complete code to reproduce the problem).

Your answer

Anonymous

2023-10-25T09:44:18.3666667+00:00

Hi @Al , Welcome to Microsoft Q&A,

Please provide more information, what code are you currently using?

Add reproducible c# code.
Al 20 Reputation points

2023-10-25T10:49:17.6533333+00:00

Hi! I am using shared code https://stackoverflow.com/a/35533927/2208894

What going wrong?

After changing preamble Wireshark says that there is Http 200 OK received but program freezes at line

await stream.CopyToAsync(memory);

I have changed preamble to this one by Richard Blum

Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("1.2.3.4"),1234); sock.Connect(ipep); var stream = new NetworkStream(sock);
Hui Liu-MSFT 48,681 Reputation points Microsoft External Staff

2023-11-01T07:40:27.62+00:00

Hi,@ Al. Welcome to Microsoft Q&A Forum.

What is the type of your project? Not sure the specific cause of the problem.

The freezing issue in your code might be related to not properly handling the end of the HTTP response. You could try to modify your code to handle the end of the response correctly and ensure that you close the connection after reading the response.

private static async Task<string> HttpRequestAsync() { string result = string.Empty; using (var tcp = new TcpClient("www.bing.com", 80)) using (var stream = tcp.GetStream()) { tcp.SendTimeout = 500; tcp.ReceiveTimeout = 1000; // Send request headers var builder = new StringBuilder(); builder.AppendLine("GET /?scope=images&nr=1 HTTP/1.1"); builder.AppendLine("Host: www.bing.com"); builder.AppendLine("Connection: close"); // Ensure the connection is closed after the response builder.AppendLine(); var header = Encoding.ASCII.GetBytes(builder.ToString()); await stream.WriteAsync(header, 0, header.Length); // Receive data using (var memory = new MemoryStream()) { await stream.CopyToAsync(memory); // Ensure the end of the stream is reached before processing the response while (stream.DataAvailable) { await stream.CopyToAsync(memory); } memory.Position = 0; var data = memory.ToArray(); // Rest of your code... } return result; } }

If you still have questions, please feel free to let me know. The problem will be better solved if more details are described (steps, error messages, and complete code to reproduce the problem).

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How to fixbThe requested address is not valid in its context

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