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我有两个使用面向 .Net 框架 4.0 的System.Web.Http.SelfHost的自托管 .Net 应用程序，两个应用程序都通过 https 进行通信。

第一个应用程序使用端口：3287，第二个应用程序使用端口：3286

当我使用HttpWebRequest类从第一个应用程序调用第二个应用程序时，我得到了这个异常

System.Net.WebException: Unable to connect to the remote server ---> 
System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:49543
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)
at System.Net.HttpWebRequest.GetRequestStream()

这是我的 C# 代码

HttpWebRequest request = WebRequest.Create("https://localhost.company.com:3286/"+ EndPoint) as HttpWebRequest;
ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => 
{
    return true;
};
request.Method = "POST";
request.ContentType = "application/json";
request.ContentLength = data.Length;
request.AllowAutoRedirect = false;
request.Expect = "application/json";
request.GetRequestStream().Write(data, 0, data.Length);
HttpWebResponse httpResponse = request.GetResponse() as HttpWebResponse;
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
    string s = streamReader.ReadToEnd();
    return s;
}

因为我正在调用端口 3286，但在异常日志中端口号更改为 49543。

如果我通过邮递员调用我的应用程序，我可以得到它的响应。

证书 localhost.company.com 映射到 127.0.0.1，我也映射到了主机文件中。

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