Here is a straightforward way to test ports on a local or remote system. You can even specify a timeout (in milliseconds):
function Get-PortInfo { param ( [Parameter(Mandatory)] [Int] $Port, [Parameter(Mandatory)] [Int] $TimeoutMilliseconds, [String] $ComputerName = $env:COMPUTERNAME ) # try and establish a connection to port async $tcpobject = New-Object System.Net.Sockets.TcpClient $connect = $tcpobject.BeginConnect($computername,$port,$null,$null) # wait for the connection no longer than $timeoutMilliseconds $wait = $connect.AsyncWaitHandle.WaitOne($timeoutMilliseconds,$false) # return rich information $result = @{ ComputerName = $ComputerName } if(!$wait) { # timeout $tcpobject.Close() $result.Online = $false $result.Error = 'Timeout' } else { try { # try and complete the connection $null = $tcpobject.EndConnect($connect) $result.Online = $true } catch { $result.Online = $false } $tcpobject.Close() } $tcpobject.Dispose() [PSCustomObject]$result }
Scanning ports is now pretty easy:
PS> Get-PortInfo -Port 139 -TimeoutMilliseconds 1000 ComputerName Online ------------ ------ DESKTOP-7AAMJLF True PS> Get-PortInfo -Port 139 -TimeoutMilliseconds 1000 -ComputerName storage2 Error ComputerName Online ----- ------------ ------ Timeout storage2 False
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