我正在尝试使用 ASP.Net Core 6 连接服务器。当我在本地主机上运行它时，它工作正常，但是当我在服务器上发布时，我收到错误。我将我的服务器项目发布到 FileZilla。 IP 地址和端口正确。但是，我收到此错误消息：
插座已连接。
发送 19 个字节到服务器。
System.Net.Sockets.SocketException (10054)：现有连接被远程主机强制关闭。 在System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException（SocketError错误，CancellationToken取消令牌） 在 System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource.GetResult（Int16 令牌） 在 System.Threading.Tasks.ValueTask`1.ValueTaskSourceAsTask.<>c.<.cctor>b__4_0（对象状态） --- 先前位置的堆栈跟踪结束 --- 在 System.Threading.Tasks.TaskToApm.End[TResult](IAsyncResult asyncResult) 在 System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult) 在 C:\Users 中的 AsynchronousClient.ReceiveCallback(IAsyncResult ar) 奥泽尔\来源 epos\Client1\Client1\Program.cs：第 129 行
错误行：
int bytesRead = client.EndReceive(ar);
我明白已建立连接。但我不明白为什么它被远程主机强制关闭，我收到了这个错误。是不是防火墙问题或者类似的问题？我该如何解决这个问题？
这是我用于检查连接的客户端项目：
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;
// State object for receiving data from remote device.
public class StateObject
{
// Client socket.
public Socket workSocket = null;
// Size of receive buffer.
public const int BufferSize = 256;
// Receive buffer.
public byte[] buffer = new byte[BufferSize];
// Received data string.
public StringBuilder sb = new StringBuilder();
}
public class AsynchronousClient
{
// The port number for the remote device.
private const int port = 443;
// ManualResetEvent instances signal completion.
private static ManualResetEvent connectDone =
new ManualResetEvent(false);
private static ManualResetEvent sendDone =
new ManualResetEvent(false);
private static ManualResetEvent receiveDone =
new ManualResetEvent(false);
// The response from the remote device.
private static String response = String.Empty;
private static void StartClient()
{
// Connect to a remote device.
try
{
// Establish the remote endpoint for the socket.
// The name of the
// remote device is "host.contoso.com".
IPHostEntry ipHostInfo = Dns.GetHostEntry("networks.net");
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint remoteEP = new IPEndPoint(ipAddress, port);
// Create a TCP/IP socket.
Socket client = new Socket(ipAddress.AddressFamily,
SocketType.Stream, ProtocolType.Tcp);
// Connect to the remote endpoint.
client.BeginConnect(remoteEP,
new AsyncCallback(ConnectCallback), client);
connectDone.WaitOne();
// Send test data to the remote device.
Send(client, "deneme fkfglb <EOF>");
sendDone.WaitOne();
// Receive the response from the remote device.
Receive(client);
receiveDone.WaitOne();
// Write the response to the console.
Console.WriteLine("Response received : {0}", response);
// Release the socket.
client.Shutdown(SocketShutdown.Both);
client.Close();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void ConnectCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object.
Socket client = (Socket)ar.AsyncState;
// Complete the connection.
client.EndConnect(ar);
Console.WriteLine("Socket connected to {0}",
client.RemoteEndPoint.ToString());
// Signal that the connection has been made.
connectDone.Set();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void Receive(Socket client)
{
try
{
// Create the state object.
StateObject state = new StateObject();
state.workSocket = client;
// Begin receiving the data from the remote device.
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReceiveCallback), state);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void ReceiveCallback(IAsyncResult ar)
{
try
{
// Retrieve the state object and the client socket
// from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
Socket client = state.workSocket;
// Read data from the remote device.
int bytesRead = client.EndReceive(ar);
if (bytesRead > 0)
{
// There might be more data, so store the data received so far.
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
// Get the rest of the data.
client.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReceiveCallback), state);
}
else
{
// All the data has arrived; put it in response.
if (state.sb.Length > 1)
{
response = state.sb.ToString();
}
// Signal that all bytes have been received.
receiveDone.Set();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private static void Send(Socket client, String data)
{
// Convert the string data to byte data using ASCII encoding.
byte[] byteData = Encoding.ASCII.GetBytes(data);
// Begin sending the data to the remote device.
client.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), client);
}
private static void SendCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object.
Socket client = (Socket)ar.AsyncState;
// Complete sending the data to the remote device.
int bytesSent = client.EndSend(ar);
Console.WriteLine("Sent {0} bytes to server.", bytesSent);
// Signal that all bytes have been sent.
sendDone.Set();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
public static int Main(String[] args)
{
StartClient();
return 0;
}
} ```
可能存在错误的消息格式、防火墙、客户端和服务器之间的库版本不匹配、不是管理员用户或不支持的连接格式等问题。
我建议检查 EventViewer 以查看扩展/更好的错误。
稍后，如果您不确定连接，我建议您从 github 或其他地方下载工作示例并检查它是否有效。
如果有效，可能与防火墙无关，而是潜在的库问题，如果该示例也不起作用，那么在这种情况下，可能是防火墙、防病毒或不是管理问题。
发现此错误的另一个解决方案可能是使用 WireShark 来跟踪服务器和客户端之间的包。如果您可以看到任何重复的 RST 包，则表明有东西正在终止连接。