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我有一个用 C# .Net 2.0 编写的客户端服务器应用程序。我已经让客户端/服务器响应/请求代码运行了 4 年（！）。最近在某台机器上，客户端连接不上服务器：

在代码行上：

HttpWebResponse response = (HttpWebResponse)request.GetResponse();

WebException：远程服务器返回错误：（503）服务器不可用。
Message="远程服务器返回错误：(503) 服务器不可用。"
状态 System.Net.WebExceptionStatus.ProtocolError

我相信这个问题是特定于机器的，因为我在任何其他机器上都没有遇到过这个问题。

我需要在那台机器上配置什么吗？我错过了什么？

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(string.Format("http://{0}:{1}/", server, httpPort));
request.ContentType = "application/x-www-form-urlencoded";
string msgStr = msgString;
byte[] buffer = Encoding.UTF8.GetBytes(msgStr);
request.ContentLength = buffer.Length;
request.Method = "POST";

try {
    System.IO.Stream requestStream = request.GetRequestStream();
    requestStream.Write(buffer, 0, buffer.Length);
    requestStream.Close();
    requestStream.Dispose();

    HttpWebResponse response = (HttpWebResponse)request.GetResponse();

    byte[] inBuffer = new byte[10000];
    Stream responseStream = response.GetResponseStream();
    int iBytes = responseStream.Read(inBuffer, 0, inBuffer.Length);

    StringBuilder sb = new StringBuilder(10000);

    while (iBytes > 0) {
        sb.Append(Encoding.UTF8.GetString(inBuffer, 0, iBytes));
        iBytes = responseStream.Read(inBuffer, 0, inBuffer.Length);
    }

    response.Close();
    responseStream.Close();
    responseStream.Dispose();

    if (!string.IsNullOrEmpty(sb.ToString())) {
        message = HandleMessage(sb.ToString());
    } else { //bug 58
        message = HandleEmptyMessage(msgString);
    }
}  catch (System.Net.WebException we) {
    _connected = false;
    EventsHelper.AsyncFire(ConnectionLost, this, EventArgs.Empty);
    throw new Exception(we.Message);
}
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