Windows 防火墙阻止 ICMP 端口无法访问？

发布于 2024-11-17 12:29:33 字数 560 浏览 1 评论 0原文

我正在尝试确定远程主机是否正在侦听特定的 UDP 端口号。我按如下方式执行此操作（在 C# 中）：

 Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
  int sent = socket.SendTo(bufsend, bufsend.Length, SocketFlags.None, endpoint);
  int recv = socket.ReceiveFrom(bufrecv, ref endpoint);

如果没有人在侦听，我会收到 ICMP“端口无法访问”，该消息在接收时报告为套接字异常，错误代码为 WSAECONNRESET (10054)。所有这些都是有道理的，但只有在禁用 Windows 防火墙时才会发生。如果启用了防火墙——即使我为程序设置了例外——我会收到错误代码 WSAETIMEDOUT (10060)，大概是因为防火墙已经占用了 ICMP“端口无法访问”。

有什么建议吗？我检查了防火墙的“高级安全”设置，但无济于事。

谢谢...

原文

I'm attempting to determine whether or not a remote host is listening on a particular UDP port number. I do this (in C#) as follows:

 Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
  int sent = socket.SendTo(bufsend, bufsend.Length, SocketFlags.None, endpoint);
  int recv = socket.ReceiveFrom(bufrecv, ref endpoint);

If no one is listening, I get an ICMP "port unreachable" which is reported on the receive as a socket exception with ErrorCode WSAECONNRESET (10054). All that makes sense, BUT it only happens when the Windows firewall is disabled. If the firewall is enabled -- even if I make an exception for the program -- I get ErrorCode WSAETIMEDOUT (10060), presumably because the firewall has eaten the ICMP "port unreachable".

Any suggestions? I've examined the firewall "advanced security" settings, but to no avail.

Thanks...

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