$defaultPort = 7456

$userPort = Read-Host "enter port [$defaultPort]:"

if ($userPort -eq "")
{
    $userPort = $defaultPort
}

Write-Host "free port: $userPort"


Get-NetTCPConnection -State Listen | Where-Object { $_.LocalPort -eq $userPort } | ForEach-Object { Get-Process -ID $_.OwningProcess } | Stop-Process