# Sample: one authorised destination, one TCP port. No scanning or stored secrets.
[CmdletBinding()]
param(
    [ValidateNotNullOrEmpty()][string]$ComputerName = 'localhost',
    [ValidateRange(1,65535)][int]$Port = 443
)
$result = Test-NetConnection -ComputerName $ComputerName -Port $Port -WarningAction SilentlyContinue
[pscustomobject]@{
    Target = $ComputerName
    Port = $Port
    TcpReachable = [bool]$result.TcpTestSucceeded
}
# TCP reachability does not verify TLS, authentication or application health.