如何检查网络端口访问并显示有用的消息？

Question

我试图检查端口是否打开使用PowerShell,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,那么它就具有访问权限.有没有办法检查成功并显示一些消息,如"端口443是否可操作"？

Answer 1

如果您运行的是Windows 8/Windows Server 2012或更高版本,则可以在PowerShell中使用Test-NetConnection命令.

例如: __CODE__

Answer 2

我以几种方式改进了Salselvaprabu的答案:

1. 它现在是一个功能 - 您可以放入您的powershell配置文件并随时使用
2. 它可以接受主机作为主机名或IP地址
3. 如果主机或端口不可用,则不再有例外 - 只是文本

像这样称呼它:

Test-Port example.com 999
Test-Port 192.168.0.1 80

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()
        $msg = "Port $port is operational"
    }
    else
    {
        $msg = "Port $port on $ip is closed, "
        $msg += "You may need to contact your IT team to open it. "                                 
    }
    Write-Host $msg
}

Answer 3

实际上,Shay levy的答案几乎是正确的,但我在他的评论栏中提到了一个奇怪的问题.所以我将命令分成两行,它工作正常.

$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. "
    }

Answer 4

您可以检查Connected属性是否设置为$ true并显示友好消息:

    $t = New-Object Net.Sockets.TcpClient "10.45.23.109", 443 

    if($t.Connected)
    {
        "Port 443 is operational"
    }
    else
    {
        "..."
    }

Answer 5

使用最新版本的PowerShell,有一个新的cmdlet Test-NetConnection.

实际上,此cmdlet可以ping一个端口,如下所示:

Test-NetConnection -ComputerName <remote server> -Port nnnn

我知道这是一个老问题,但如果你打这个页面(像我一样)在寻找这个信息,这除了可能会有所帮助!