Why is My WCF 4.0 File Upload Failing with Error 'No connection could be made because the target machine actively refused it. 127.0.0.1:3446'?

WCF 4.0 file upload failed: Connection refused error (127.0.0.1:3446)

Problem description: When using WCF 4.0 for file upload via streaming, the following error occurs: "The connection cannot be established because the target computer actively rejected it. 127.0.0.1:3446"

Error details:

• The error occurs at the following line of code: Stream serverStream = request.GetRequestStream();
The
• code attempts to connect to the REST endpoint using HttpWebRequest and HttpWebResponse.

Solution:

The error message indicates that the connection request was rejected by the target computer. Possible reasons:

• Firewall: Make sure the firewall is turned off or allows connections on the specified port (3446).
• Host Process: Verify that the WCF service's host process is running and listening on port 3446.

Test method:

It is recommended not to test from a Windows Forms project, but to check the connection inside the service itself using the following code:

<code class="language-csharp">string baseAddress = "http://localhost:3446/File/AddStream/stream.txt";
using (HttpClient client = new HttpClient())
{
    var response = client.GetAsync(baseAddress).Result;
    if (response.StatusCode == HttpStatusCode.BadRequest)
    {
        // 错误处理
    }
}</code>

Verify using netstat:

To verify that the service is listening on the correct port, use the following command (assuming a Linux system):

<code class="language-bash">netstat -anp | grep 3446</code>

This will output a line indicating whether the service is listening on port 3446. If there is no output, the service is not listening on that port.

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