core/utils/Test-Port.ps1

<#
The MIT License (MIT)
 
Copyright (c) 2015 Objectivity Bespoke Software Specialists
 
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#>


function Test-Port {
    <#
    .SYNOPSIS
    Returns true if specified TCP port is open on remote host.
     
    .PARAMETER Hostname
    Host name.
 
    .PARAMETER Port
    Port.
 
    .PARAMETER TimeoutInMilliseconds
    If connection is not made within this time period, will return $false.
 
    .EXAMPLE
    Test-Port -Hostname 'localhost' -Port 445
    #>
   
     
    [CmdletBinding()]
    [OutputType([bool])]
    param(
        [Parameter(Mandatory=$true)]
        [string] 
        $Hostname,

        [Parameter(Mandatory=$true)]
        [int] 
        $Port,

        [Parameter(Mandatory=$false)]
        [int] 
        $TimeoutInMilliseconds = 500
    )

    try { 
        $tcpClient = New-Object -TypeName System.Net.Sockets.TcpClient
        [void]($tcpClient.BeginConnect($Hostname, $Port, $null, $null))

        $timePassed = 0
        while (!$tcpClient.Connected -and $timePassed -le $TimeoutInMilliseconds) {
            Start-Sleep -Milliseconds 50
            $timePassed += 50
        }
        return $tcpClient.Connected
    } catch {
        Write-Log -_Debug "Connection failed: $_"
        return $false
    } finally {
        $tcpClient.Close();
    }
}