blocks|key|5467620|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5467621|using(TcpClient+tcpClient+=+new+TcpClient())
{
++++try+{
++++++++tcpClient.Connect("127.0.0.1",+9081);
++++++++Console.WriteLine("Port+open");
++++}+catch+(Exception)+{
++++++++Console.WriteLine("Port+closed");
++++}
}|code-block|syntax|javascript|5467622|您可能应该将127.0.0.1更改为类似于192.168.0.1或您的路由器的IP地址。|5467623|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try this:

<pre><code>using(TcpClient tcpClient = new TcpClient())
{
 try {
 tcpClient.Connect("127.0.0.1", 9081);
 Console.WriteLine("Port open");
 } catch (Exception) {
 Console.WriteLine("Port closed");
 }
}
</code></pre>

You should probably change 127.0.0.1 to something like 192.168.0.1 or whatever your router's IP address is.

blocks|key|5467672|text|如果您正在连接loopback+adapter+-+localhost或127.0.0.1+(there's+no+place+like+127.0.0.1!)，则不太可能连接到路由器。操作系统足够智能，能够识别出这是一个特殊的地址。如果你实际指定了你机器的“真实”IP地址，我不知道这是否也是真的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5467673|另请参阅此问题：What+is+the+purpose+of+the+Microsoft+Loopback+Adapter?|5467674|还要注意，运行traceroute+localhost+(Windows中的tracert+localhost)会显示涉及到的唯一网络节点是您自己的机器。路由器从不参与其中。|5467675|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Loopback#Virtual_network_interface|1|http://www.thinkgeek.com/product/5d6a/|2|https://stackoverflow.com/questions/2021415/what-is-the-purpose-of-the-microsoft-loopback-adapter^0|Q|9|10|9|7|G|0|1B|W|1|0|8|1I|2|0|7|K|12|H|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@$9|10|A|11|1|12]|$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|6|7|16|8|@]|D|@$9|17|A|18|1|19]]|E|$]]|$1|H|3|I|5|6|7|1A|8|@$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]|R|$5|M|N|O|E|$P|S]]|T|$5|M|N|O|E|$P|U]]]]

If you're connecting to the <a href="http://en.wikipedia.org/wiki/Loopback#Virtual_network_interface" rel="nofollow noreferrer">loopback adapter</a> &mdash; <code>localhost</code> or <code>127.0.0.1</code> (<a href="http://www.thinkgeek.com/product/5d6a/" rel="nofollow noreferrer">there's no place like 127.0.0.1!</a>), you're unlikely to ever go out to the router. The OS is smart enough to recognize that it's a special address. Dunno if that holds true as well if you actually specify your machine's "real" IP address.

See also this question: <a href="https://stackoverflow.com/questions/2021415/what-is-the-purpose-of-the-microsoft-loopback-adapter">What is the purpose of the Microsoft Loopback Adapter?</a>

Also note that running <code>traceroute localhost</code> (<code>tracert localhost</code> in Windows) shows that the only network node involved is your own machine. The router is never involved.

blocks|key|1590530|text|无法从LAN内部测试路由器上的端口转发，您需要从WAN+(internet)端连接，以查看端口转发是否正常工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1590531|几个互联网站点提供了检查端口是否打开的服务：|1590532|What's+My+IP+Port+Scanner|offset|length|1590533|GRC+%7C+ShieldsUP!|1590534|如果您想使用自己的代码进行检查，则需要确保TCP/IP连接通过外部代理重新路由或设置隧道。这与你的代码无关，这是基本的网络基础知识。|1590535|entityMap|0|LINK|mutability|MUTABLE|url|http://www.whatsmyip.org/port-scanner/|1|https://www.grc.com/x/ne.dll?bh0bkyd2^0|0|0|0|P|0|0|0|G|1|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@$F|Y|G|Z|1|10]]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@$F|12|G|13|1|14]]|A|$]]|$1|J|3|K|5|6|7|15|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|U]]]]

A port forward on the router cannot be tested from inside the LAN, you need to connect from the WAN (internet) side to see if a port forward is working or not.

Several internet sites offer services to check if a port is open:

<a href="http://www.whatsmyip.org/port-scanner/" rel="nofollow">What's My IP Port Scanner</a>

<a href="https://www.grc.com/x/ne.dll?bh0bkyd2" rel="nofollow">GRC | ShieldsUP!</a>

If you want to check with your own code, then you need to make sure the TCP/IP connection is rerouted via an external proxy or setup a tunnel. This has nothing to do with your code, it's basic networking 101.

blocks|key|4049243|text|一个更好的解决方案，你甚至可以指定一个超时：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4049244|using+System;
using+System.Net.Sockets;

//+...

bool+IsPortOpen(string+host,+int+port,+TimeSpan+timeout)
{
++++try
++++{
++++++++using(var+client+=+new+TcpClient())
++++++++{
++++++++++++var+result+=+client.BeginConnect(host,+port,+null,+null);
++++++++++++var+success+=+result.AsyncWaitHandle.WaitOne(timeout);
++++++++++++client.EndConnect(result);
++++++++++++return+success;
++++++++}
++++}
++++catch
++++{
++++++++return+false;
++++}
}|code-block|syntax|javascript|4049245|并且，在F#中：|4049246|open+System
open+System.Net.Sockets

let+isPortOpen+(host:+string)+(port:+int)+(timeout:+TimeSpan):+bool+=
++++try
++++++++use+client+=+new+TcpClient()
++++++++let+result+=+client.BeginConnect(host,+port,+null,+null)
++++++++let+success+=+result.AsyncWaitHandle.WaitOne+timeout
++++++++client.EndConnect+result
++++++++success
++++with
++++%7C+_+->+false

let+available+=+isPortOpen+"stackoverflow.com"+80+(TimeSpan.FromSeconds+10.)
printf+"Is+stackoverflow+available?+%25b"+available|4049247|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

A better solution where you can even specify a timeout:

<pre class="lang-cs prettyprint-override"><code>using System;
using System.Net.Sockets;

// ...

bool IsPortOpen(string host, int port, TimeSpan timeout)
{
 try
 {
 using(var client = new TcpClient())
 {
 var result = client.BeginConnect(host, port, null, null);
 var success = result.AsyncWaitHandle.WaitOne(timeout);
 client.EndConnect(result);
 return success;
 }
 }
 catch
 {
 return false;
 }
}
</code></pre>

And, in F#:

<pre><code>open System
open System.Net.Sockets

let isPortOpen (host: string) (port: int) (timeout: TimeSpan): bool =
 try
 use client = new TcpClient()
 let result = client.BeginConnect(host, port, null, null)
 let success = result.AsyncWaitHandle.WaitOne timeout
 client.EndConnect result
 success
 with
 | _ -&gt; false

let available = isPortOpen "stackoverflow.com" 80 (TimeSpan.FromSeconds 10.)
printf "Is stackoverflow available? %b" available
</code></pre>

blocks|key|4049298|text|除非有程序在监听该端口，否则无法知道该端口是否在您的路由器中转发。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4049299|正如您在克林顿的答案中看到的，正在使用的.Net类是TcpClient，这是因为您正在使用TCP套接字进行连接。这就是操作系统建立连接的方式:使用套接字。但是，路由器只是将数据包(+OSI模型的第3层)转发进来或转发出去。在您的例子中，您的路由器正在执行的操作称为:+NAT。一个或多个内网IP共享一个外网IP。这就是为什么你要做一个端口转发。|4049300|在数据包的路径上可能有很多路由器，您永远不会知道发生了什么。|4049301|让我们假设你正在用传统的方式发送一封信。也许你可以在信中写下接收者必须回复，以检查他/她是否在那里(你和接收者是插座)。如果你收到了回复，你肯定他/她在那里，但如果你没有收到任何东西，你就不知道是邮递员(在你的情况下是路由器)忘了投递信件，还是接收者没有回复。你也永远不会知道邮递员是否让朋友递送那封信。此外，邮递员不会为了知道他/她可能会回复而打开信件，因为你正在等待回复。你所能做的就是等待一段时间来收到答案。如果你在这段时间内没有收到任何东西，你就会认为收信人不在你寄出信件的地方。这是一个“超时”。|4049302|我看到一个答案提到了nmap软件。这真的是一个非常好和复杂的软件，但我认为它会以同样的方式工作。如果没有应用程序在该端口上侦听，则无法知道该端口是否打开。|4049303|如果我说清楚了，请告诉我。|4049304|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Q|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

There is no way to know if the port is forwarded in your router, except if there is a program listening on that port.

As you may see in the Clinton answer, the .Net class being used is TcpClient and that is because you are using a TCP socket to connect to. That is the way operating systems make connections: using a socket. However, a router just forwards the packets (layer 3 of the OSI Model) in or out. In your case, what your router is doing is called: NAT. It is one public IP shared by a one or more private IPs. That´s why you are making a port forwarding.

There may be a lot of routers in the path of the packets, and you will never know what had happened.

Let´s imagine you are sending a letter in the traditional way. Perhaps you can write in the letter that the receiver must answer, in order to check he/she is there (you and the receiver are the sockets). If you receive an answer you will be sure he/she is there, but if you don´t receive anything you don´t know if the mailman (in your case the router) forgot to deliver the letter, or the receiver hadn´t answered. You would also never know if the mailman has asked a friend to deliver that letter. Moreover, the mailman won´t open the letter in order to know he/she may answer because you are waiting for a reply. All you may do is wait some time to receive the answer. If you don´t receive anything in that period you will assume that the receiver isn´t where you sent the letter. That is a "timeout".

I saw an answer mentioning the nmap software. It´s really a very good and complex soft, but I think it will work in the same way. If there is no app listening in that port, there is no way to know if it is open or not.

Please, let me know if I was clear.

blocks|key|4049335|text|对我来说，我需要一些阻塞的东西，直到端口的连接可用或经过一定数量的重试之后。所以，我想出了这段代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4049336|public+bool+IsPortOpen(string+host,+int+port,+int+timeout,+int+retry)
{
++++var+retryCount+=+0;
++++while+(retryCount+<+retry)
++++{
++++++++if+(retryCount+>+0)
++++++++++++Thread.Sleep(timeout);

++++++++try
++++++++{
++++++++++++using+(var+client+=+new+TcpClient())
++++++++++++{
++++++++++++++++var+result+=+client.BeginConnect(host,+port,+null,+null);
++++++++++++++++var+success+=+result.AsyncWaitHandle.WaitOne(timeout);
++++++++++++++++if+(success)
++++++++++++++++++++return+true;

++++++++++++++++client.EndConnect(result);
++++++++++++}
++++++++}
++++++++catch
++++++++{
++++++++++++//+ignored
++++++++}
++++++++finally+{+retryCount%2B%2B;+}
++++}

++++return+false;
}|code-block|syntax|javascript|4049337|希望这能有所帮助！|4049338|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

For me, I needed something blocking until the connection to the port is available or after a certain amount of retries. So, I figured out this code:

<pre><code>public bool IsPortOpen(string host, int port, int timeout, int retry)
{
 var retryCount = 0;
 while (retryCount &lt; retry)
 {
 if (retryCount &gt; 0)
 Thread.Sleep(timeout);

 try
 {
 using (var client = new TcpClient())
 {
 var result = client.BeginConnect(host, port, null, null);
 var success = result.AsyncWaitHandle.WaitOne(timeout);
 if (success)
 return true;

 client.EndConnect(result);
 }
 }
 catch
 {
 // ignored
 }
 finally { retryCount++; }
 }

 return false;
}
</code></pre>

Hope this helps!

blocks|key|5467882|text|public+static+bool+PortInUse(int++port)
{
++++bool+inUse+=+false;

++++IPGlobalProperties+ipProperties+=+IPGlobalProperties.GetIPGlobalProperties();
++++IPEndPoint+[]+ipEndPoints+=+ipProperties.GetActiveTcpListeners();


++++foreach(IPEndPoint+endPoint+in+ipEndPoints)
++++{
++++++++if(endPoint.Port+==+port)
++++++++{
++++++++++++inUse+=+true;
++++++++++++break;
++++++++}
++++}


++++return++inUse;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5467883|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public static bool PortInUse(int port)
{
 bool inUse = false;

 IPGlobalProperties ipProperties = IPGlobalProperties.GetIPGlobalProperties();
 IPEndPoint [] ipEndPoints = ipProperties.GetActiveTcpListeners();


 foreach(IPEndPoint endPoint in ipEndPoints)
 {
 if(endPoint.Port == port)
 {
 inUse = true;
 break;
 }
 }


 return inUse;
}
</code></pre>

blocks|key|1590586|text|public+string+GetAvailablePort()
++++++++{int+startingPort=1000;
++++++++++++string+portnumberinformation+=+string.Empty;
++++++++++++IPEndPoint[]+endPoints;
++++++++++++List<int>+portArray+=+new+List<int>();
++++++++++++IPGlobalPr`enter+code+here`operties+properties+=+IPGlobalProperties.GetIPGlobalProperties();`enter+code+here`


++++++++++++//getting+active+tcp+listners+
++++++++++++endPoints+=+properties.GetActiveTcpListeners();
++++++++++++portArray.AddRange(from+n+in+endPoints
+++++++++++++++++++++++++++++++where+n.Port+>=+startingPort
+++++++++++++++++++++++++++++++select+n.Port);++++

++++++++++++portArray.Sort();

++++++++++++for+(int+i+=+0;+i+<+portArray.Count;+i%2B%2B)
++++++++++++{
++++++++++++++++if+(check+condition)
++++++++++++++++{
++++++++++++++++++++do+somting
++++++++++++++++}
++++++++++++}

++++++++++++return+portnumberinformation;
++++++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1590587|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public string GetAvailablePort()
 {int startingPort=1000;
 string portnumberinformation = string.Empty;
 IPEndPoint[] endPoints;
 List&lt;int&gt; portArray = new List&lt;int&gt;();
 IPGlobalPr`enter code here`operties properties = IPGlobalProperties.GetIPGlobalProperties();`enter code here`


 //getting active tcp listners 
 endPoints = properties.GetActiveTcpListeners();
 portArray.AddRange(from n in endPoints
 where n.Port &gt;= startingPort
 select n.Port); 

 portArray.Sort();

 for (int i = 0; i &lt; portArray.Count; i++)
 {
 if (check condition)
 {
 do somting
 }
 }

 return portnumberinformation;
 }
</code></pre>

blocks|key|4049405|text|如果它是路由器，那么通过在线服务检查它的最简单方法是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4049406|4049407|Port+Checker|unordered-list-item|offset|length|4049408|Port+Forwarding+Test|4049409|4049410|您也可以尝试使用telenet检查端口是否可访问|style|BOLD|4049411|telenet+[ip-address]+[port]+|code-block|syntax|javascript|4049412|entityMap|0|LINK|mutability|MUTABLE|url|https://www.portcheckers.com/|1|https://www.portforwarding.org/^0|0|0|0|C|0|0|0|K|1|0|0|8|7|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|15|8|@]|9|@$F|16|G|17|1|18]]|A|$]]|$1|H|3|I|5|E|7|19|8|@]|9|@$F|1A|G|1B|1|1C]]|A|$]]|$1|J|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1E|8|@$F|1F|G|1G|M|N]]|9|@]|A|$]]|$1|O|3|P|5|Q|7|1H|8|@]|9|@]|A|$R|S]]|$1|T|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]|11|$5|W|X|Y|A|$Z|12]]]]

If it is Router the simplest way to check it through online services like 

<ul>
<li><a href="https://www.portcheckers.com" rel="nofollow noreferrer">Port Checker</a></li>
<li><a href="https://www.portforwarding.org/" rel="nofollow noreferrer">Port Forwarding Test</a></li>
</ul>

You can also try using telenet to chek wether port is accessible or not

<pre><code>telenet [ip-address] [port] 
</code></pre>

blocks|key|1939025|text|除了BeginConnect之外，您还可以使用ConnectAsync+(我想是在.NET+Framework4.5中添加的吧？)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1939026|TcpClient+client+=+null;

try+{
++++client+=+new+TcpClient();
++++var+task+=+client.ConnectAsync(host,+port);
++++if+(task.Wait(timeout))+{//if+fails+within+timeout,+task.Wait+still+returns+true.
++++++++if+(client.Connected)+{
++++++++++++//+port+reachable
++++++++}
++++++++else
++++++++++++//+connection+refused+probably
++++}
++++else
++++++++//+timed+out
}
catch+(Exception+ex)+{
++++//+connection+failed
}
finally+{
++++client.Close();
}|code-block|syntax|javascript|1939027|完整的项目是here，因为paping拒绝运行，我也找不到另一个我喜欢的"ping+host:port“工具。|offset|length|1939028|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/changbowen/PortPing^0|0|0|6|4|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Other than BeginConnect you can also use ConnectAsync (added in .NET Framework 4.5 I think?).
<pre><code>TcpClient client = null;

try {
 client = new TcpClient();
 var task = client.ConnectAsync(host, port);
 if (task.Wait(timeout)) {//if fails within timeout, task.Wait still returns true.
 if (client.Connected) {
 // port reachable
 }
 else
 // connection refused probably
 }
 else
 // timed out
}
catch (Exception ex) {
 // connection failed
}
finally {
 client.Close();
}
</code></pre>
Full project is <a href="https://github.com/changbowen/PortPing" rel="nofollow noreferrer">here</a> because paping refuses to run and I couldn't find another &quot;ping host:port&quot; tool to my likes.

I can't seem to find anything that tells me if a port in my router is open or not.
Is this even possible?

The code I have right now doesn't really seem to work...

<pre><code>private void ScanPort()
{
 string hostname = "localhost";
 int portno = 9081;
 IPAddress ipa = (IPAddress) Dns.GetHostAddresses(hostname)[0];
 try
 {
 System.Net.Sockets.Socket sock =
 new System.Net.Sockets.Socket(System.Net.Sockets.AddressFamily.InterNetwork,
 System.Net.Sockets.SocketType.Stream,
 System.Net.Sockets.ProtocolType.Tcp);
 sock.Connect(ipa, portno);
 if (sock.Connected == true) // Port is in use and connection is successful
 MessageBox.Show("Port is Closed");
 sock.Close();
 }
 catch (System.Net.Sockets.SocketException ex)
 {
 if (ex.ErrorCode == 10061) // Port is unused and could not establish connection 
 MessageBox.Show("Port is Open!");
 else
 MessageBox.Show(ex.Message);
 }
}
</code></pre>

Check if a port is open

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我似乎找不到任何能告诉我路由器中的端口是否打开的东西。这有可能吗？我现在拥有的代码似乎并不是真的有效...private void ScanPort(){    string hostname = "localhost";    int portno = 9081;    IPAddress ipa = (IPAddr...

问检查端口是否打开
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