blocks|key|417527|text|实际上，谢伊·列维的回答几乎是正确的，但正如我在他的评论专栏中提到的那样，我遇到了一个奇怪的问题。因此，我将命令拆分为两行，它可以很好地工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|417528|$Ipaddress=+Read-Host+"Enter+the+IP+address:"
$Port=+Read-host+"Enter+the+port+number+to+access:"

$t+=+New-Object+Net.Sockets.TcpClient
$t.Connect($Ipaddress,$Port)
++++if($t.Connected)
++++{
++++++++"Port+$Port+is+operational"
++++}
++++else
++++{
++++++++"Port+$Port+is+closed,+You+may+need+to+contact+your+IT+team+to+open+it.+"
++++}|code-block|syntax|javascript|417529|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Actually Shay levy's answer is almost correct but i got an weird issue as i mentioned in his comment column. So i split the command into two lines and it works fine.

<pre><code>$Ipaddress= Read-Host "Enter the IP address:"
$Port= Read-host "Enter the port number to access:"

$t = New-Object Net.Sockets.TcpClient
$t.Connect($Ipaddress,$Port)
 if($t.Connected)
 {
 "Port $Port is operational"
 }
 else
 {
 "Port $Port is closed, You may need to contact your IT team to open it. "
 }
</code></pre>

blocks|key|632704|text|如果你运行的是Windows8/+Windows+Server2012或更新版本，你可以在PowerShell中使用Test-NetConnection命令。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|632705|例如：|632706|Test-NetConnection+-Port+53+-ComputerName+LON-DC1|code-block|syntax|javascript|632707|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/powershell/module/nettcpip/test-netconnection^0|1M|I|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

If you're running Windows 8/Windows Server 2012 or newer, you can use the <a href="https://docs.microsoft.com/en-us/powershell/module/nettcpip/test-netconnection" rel="noreferrer">Test-NetConnection</a> command in PowerShell.

Ex:

<pre><code>Test-NetConnection -Port 53 -ComputerName LON-DC1
</code></pre>

blocks|key|632556|text|您可以检查Connected属性是否设置为$true并显示一条友好的消息：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632557|++++$t+=+New-Object+Net.Sockets.TcpClient+"10.45.23.109",+443+

++++if($t.Connected)
++++{
++++++++"Port+443+is+operational"
++++}
++++else
++++{
++++++++"..."
++++}|code-block|syntax|javascript|632558|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can check if the Connected property is set to $true and display a friendly message:

<pre><code> $t = New-Object Net.Sockets.TcpClient "10.45.23.109", 443 

 if($t.Connected)
 {
 "Port 443 is operational"
 }
 else
 {
 "..."
 }
</code></pre>

blocks|key|632780|text|在最新版本的PowerShell中，有一个新的cmdlet，即Test-NetConnection。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632781|实际上，此cmdlet允许您ping端口，如下所示：|632782|Test-NetConnection+-ComputerName+<remote+server>+-Port+nnnn|code-block|syntax|javascript|632783|我知道这是一个古老的问题，但是如果你点击这个页面(就像我一样)寻找这个信息，这个补充可能会有帮助！|632784|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

With the latest versions of PowerShell, there is a new cmdlet, Test-NetConnection.

This cmdlet lets you, in effect, ping a port, like this:

<pre><code>Test-NetConnection -ComputerName &lt;remote server&gt; -Port nnnn
</code></pre>

I know this is an old question, but if you hit this page (as I did) looking for this information, this addition may be helpful!

blocks|key|417552|text|我试着改进mshutov的建议。我添加了将输出用作对象的选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|417553|+function+Test-Port($hostname,+$port)
++++{
++++#+This+works+no+matter+in+which+form+we+get+$host+-+hostname+or+ip+address
++++try+{
++++++++$ip+=+[System.Net.Dns]::GetHostAddresses($hostname)+%7C+
++++++++++++select-object+IPAddressToString+-expandproperty++IPAddressToString
++++++++if($ip.GetType().Name+-eq+"Object[]")
++++++++{
++++++++++++#If+we+have+several+ip's+for+that+address,+let's+take+first+one
++++++++++++$ip+=+$ip[0]
++++++++}
++++}+catch+{
++++++++Write-Host+"Possibly+$hostname+is+wrong+hostname+or+IP"
++++++++return
++++}
++++$t+=+New-Object+Net.Sockets.TcpClient
++++#+We+use+Try\Catch+to+remove+exception+info+from+console+if+we+can't+connect
++++try
++++{
++++++++$t.Connect($ip,$port)
++++}+catch+{}

++++if($t.Connected)
++++{
++++++++$t.Close()
++++++++$object+=+[pscustomobject]+@{
++++++++++++++++++++++++Hostname+=+$hostname
++++++++++++++++++++++++IP+=+$IP
++++++++++++++++++++++++TCPPort+=+$port
++++++++++++++++++++++++GetResponse+=+$True+}
++++++++Write-Output+$object
++++}
++++else
++++{
++++++++$object+=+[pscustomobject]+@{
++++++++++++++++++++++++Computername+=+$IP
++++++++++++++++++++++++TCPPort+=+$port
++++++++++++++++++++++++GetResponse+=+$False+}
++++++++Write-Output+$object

++++}
++++Write-Host+$msg
}|code-block|syntax|javascript|417554|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I tried to improve the suggestion from mshutov.
I added the option to use the output as an object.

<pre><code> function Test-Port($hostname, $port)
 {
 # This works no matter in which form we get $host - hostname or ip address
 try {
 $ip = [System.Net.Dns]::GetHostAddresses($hostname) | 
 select-object IPAddressToString -expandproperty IPAddressToString
 if($ip.GetType().Name -eq "Object[]")
 {
 #If we have several ip's for that address, let's take first one
 $ip = $ip[0]
 }
 } catch {
 Write-Host "Possibly $hostname is wrong hostname or IP"
 return
 }
 $t = New-Object Net.Sockets.TcpClient
 # We use Try\Catch to remove exception info from console if we can't connect
 try
 {
 $t.Connect($ip,$port)
 } catch {}

 if($t.Connected)
 {
 $t.Close()
 $object = [pscustomobject] @{
 Hostname = $hostname
 IP = $IP
 TCPPort = $port
 GetResponse = $True }
 Write-Output $object
 }
 else
 {
 $object = [pscustomobject] @{
 Computername = $IP
 TCPPort = $port
 GetResponse = $False }
 Write-Output $object

 }
 Write-Host $msg
}
</code></pre>

blocks|key|417764|text|如果您使用的是较旧版本的Powershell，其中测试网络连接不可用，下面是主机名"my.hostname“和端口”123“的一行代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|417765|$t+=+New-Object+System.Net.Sockets.TcpClient+'my.hostname',+123;+if($t.Connected)+{"OK"}|code-block|syntax|javascript|417766|返回OK或错误消息。|417767|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|$]]

If you are using older versions of Powershell where Test-NetConnection isn't available, here is a one-liner for hostname "my.hostname" and port "123":

<pre><code>$t = New-Object System.Net.Sockets.TcpClient 'my.hostname', 123; if($t.Connected) {"OK"}
</code></pre>

Returns OK, or an error message.

blocks|key|417843|text|mshutov+&+Salselvaprabu回答得很好。我需要一些更健壮的东西，它会检查所有提供的IPAddresses，而不是只检查第一个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|417844|我还想复制一些参数名称和功能，而不是Test-Connection函数。|417845|这个新功能允许您设置重试次数和每次重试之间的延迟。享受吧！|417846|function+Test-Port+{

++++[CmdletBinding()]
++++Param+(
++++++++[string]+$ComputerName,
++++++++[int]+$Port,
++++++++[int]+$Delay+=+1,
++++++++[int]+$Count+=+3
++++)

++++function+Test-TcpClient+($IPAddress,+$Port)+{

++++++++$TcpClient+=+New-Object+Net.Sockets.TcpClient
++++++++Try+{+$TcpClient.Connect($IPAddress,+$Port)+}+Catch+{}

++++++++If+($TcpClient.Connected)+{+$TcpClient.Close();+Return+$True+}
++++++++Return+$False

++++}

++++function+Invoke-Test+($ComputerName,+$Port)+{

++++++++Try+++{+[array]$IPAddress+=+[System.Net.Dns]::GetHostAddresses($ComputerName)+%7C+Select-Object+-Expand+IPAddressToString+}+
++++++++Catch+{+Return+$False+}

++++++++[array]$Results+=+$IPAddress+%7C+%25+{+Test-TcpClient+-IPAddress+$_+-Port+$Port+}
++++++++If+($Results+-contains+$True)+{+Return+$True+}+Else+{+Return+$False+}

++++}

++++for+($i+=+1;+((Invoke-Test+-ComputerName+$ComputerName+-Port+$Port)+-ne+$True);+$i%2B%2B)
++++{
++++++++if+($i+-ge+$Count)+{
++++++++++++Write-Warning+"Timed+out+while+waiting+for+port+$Port+to+be+open+on+$ComputerName!"
++++++++++++Return+$false
++++++++}

++++++++Write-Warning+"Port+$Port+not+open,+retrying..."
++++++++Sleep+$Delay
++++}

++++Return+$true

}|code-block|syntax|javascript|417847|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Great answer by mshutov &amp; Salselvaprabu. I needed something a little bit more robust, and that checked all IPAddresses that was provided instead of checking only the first one.

I also wanted to replicate some of the parameter names and functionality than the Test-Connection function.

This new function allows you to set a Count for the number of retries, and the Delay between each try. Enjoy!

<pre><code>function Test-Port {

 [CmdletBinding()]
 Param (
 [string] $ComputerName,
 [int] $Port,
 [int] $Delay = 1,
 [int] $Count = 3
 )

 function Test-TcpClient ($IPAddress, $Port) {

 $TcpClient = New-Object Net.Sockets.TcpClient
 Try { $TcpClient.Connect($IPAddress, $Port) } Catch {}

 If ($TcpClient.Connected) { $TcpClient.Close(); Return $True }
 Return $False

 }

 function Invoke-Test ($ComputerName, $Port) {

 Try { [array]$IPAddress = [System.Net.Dns]::GetHostAddresses($ComputerName) | Select-Object -Expand IPAddressToString } 
 Catch { Return $False }

 [array]$Results = $IPAddress | % { Test-TcpClient -IPAddress $_ -Port $Port }
 If ($Results -contains $True) { Return $True } Else { Return $False }

 }

 for ($i = 1; ((Invoke-Test -ComputerName $ComputerName -Port $Port) -ne $True); $i++)
 {
 if ($i -ge $Count) {
 Write-Warning "Timed out while waiting for port $Port to be open on $ComputerName!"
 Return $false
 }

 Write-Warning "Port $Port not open, retrying..."
 Sleep $Delay
 }

 Return $true

}
</code></pre>

blocks|key|417910|text|将其归结为一个一行将变量"$port389Open“设置为True或false+-它既快速又容易地复制到端口列表中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|417911|try{$socket+=+New-Object+Net.Sockets.TcpClient($ipAddress,389);if($socket+-eq+$null){$Port389Open+=+$false}else{Port389Open+=+$true;$socket.close()}}catch{Port389Open+=+$false}|code-block|syntax|javascript|417912|如果你想变得疯狂，你可以返回整个数组-|417913|Function+StdPorts($ip){
++++$rst+=+""+%7C++select+IP,Port547Open,Port135Open,Port3389Open,Port389Open,Port53Open
++++$rst.IP+=+$Ip
++++try{$socket+=+New-Object+Net.Sockets.TcpClient($ip,389);if($socket+-eq+$null){$rst.Port389Open+=+$false}else{$rst.Port389Open+=+$true;$socket.close();$ipscore%2B%2B}}catch{$rst.Port389Open+=+$false}
++++try{$socket+=+New-Object+Net.Sockets.TcpClient($ip,53);if($socket+-eq+$null){$rst.Port53Open+=+$false}else{$rst.Port53Open+=+$true;$socket.close();$ipscore%2B%2B}}catch{$rst.Port53Open+=+$false}
++++try{$socket+=+New-Object+Net.Sockets.TcpClient($ip,3389);if($socket+-eq+$null){$rst.Port3389Open+=+$false}else{$rst.Port3389Open+=+$true;$socket.close();$ipscore%2B%2B}}catch{$rst.Port3389Open+=+$false}
++++try{$socket+=+New-Object+Net.Sockets.TcpClient($ip,547);if($socket+-eq+$null){$rst.Port547Open+=+$false}else{$rst.Port547Open+=+$true;$socket.close();$ipscore%2B%2B}}catch{$rst.Port547Open+=+$false}
++++try{$socket+=+New-Object+Net.Sockets.TcpClient($ip,135);if($socket+-eq+$null){$rst.Port135Open+=+$false}else{$rst.Port135Open+=+$true;$socket.close();$SkipWMI+=+$False;$ipscore%2B%2B}}catch{$rst.Port135Open+=+$false}
++++Return+$rst
}|417914|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|$]]

boiled this down to a one liner sets the variable "$port389Open" to True or false - its fast and easy to replicate for a list of ports

<pre><code>try{$socket = New-Object Net.Sockets.TcpClient($ipAddress,389);if($socket -eq $null){$Port389Open = $false}else{Port389Open = $true;$socket.close()}}catch{Port389Open = $false}
</code></pre>

If you want ot go really crazy you can return the an entire array- 

<pre><code>Function StdPorts($ip){
 $rst = "" | select IP,Port547Open,Port135Open,Port3389Open,Port389Open,Port53Open
 $rst.IP = $Ip
 try{$socket = New-Object Net.Sockets.TcpClient($ip,389);if($socket -eq $null){$rst.Port389Open = $false}else{$rst.Port389Open = $true;$socket.close();$ipscore++}}catch{$rst.Port389Open = $false}
 try{$socket = New-Object Net.Sockets.TcpClient($ip,53);if($socket -eq $null){$rst.Port53Open = $false}else{$rst.Port53Open = $true;$socket.close();$ipscore++}}catch{$rst.Port53Open = $false}
 try{$socket = New-Object Net.Sockets.TcpClient($ip,3389);if($socket -eq $null){$rst.Port3389Open = $false}else{$rst.Port3389Open = $true;$socket.close();$ipscore++}}catch{$rst.Port3389Open = $false}
 try{$socket = New-Object Net.Sockets.TcpClient($ip,547);if($socket -eq $null){$rst.Port547Open = $false}else{$rst.Port547Open = $true;$socket.close();$ipscore++}}catch{$rst.Port547Open = $false}
 try{$socket = New-Object Net.Sockets.TcpClient($ip,135);if($socket -eq $null){$rst.Port135Open = $false}else{$rst.Port135Open = $true;$socket.close();$SkipWMI = $False;$ipscore++}}catch{$rst.Port135Open = $false}
 Return $rst
}
</code></pre>

blocks|key|632730|text|当扫描关闭的端口时，它变得长时间无响应。将fqdn解析为ip似乎更快，如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632731|[System.Net.Dns]::GetHostAddresses("www.msn.com").IPAddressToString|code-block|syntax|javascript|632732|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

When scanning closed port it becomes unresponsive for long time. It seems to be quicker when resolving fqdn to ip like:

<pre><code>[System.Net.Dns]::GetHostAddresses("www.msn.com").IPAddressToString
</code></pre>

I was trying to check whether the port is opened or not using powershell like follows.

<pre><code>(new-object Net.Sockets.TcpClient).Connect("10.45.23.109", 443)
</code></pre>

This method works , but the output is not user-friendly. It means if there are no errors then it has access. Is there any way to check for success and display some message like " Port 443 is operational"?

How to check Network port access and display useful message?

Windows Server

Windows

我尝试使用powershell检查端口是否打开，如下所示。(new-object Net.Sockets.TcpClient).Connect("10.45.23.109", 443)此方法有效，但输出不是用户友好的。这意味着如果没有错误，那么它就有访问权。有没有办法检查是否成功，并显示一些消息，如“端口443可操作”？

问如何检查网口访问并显示有用信息？
EN

回答 9

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问如何检查网口访问并显示有用信息？EN

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问如何检查网口访问并显示有用信息？
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