$procs = Get-NetTCPConnection -LocalPort 8448 -ErrorAction SilentlyContinue
if ($procs) {
    foreach ($proc in $procs) {
        Stop-Process -Id $proc.OwningProcess -Force -ErrorAction SilentlyContinue
    }
    Write-Host "Processes stopped"
} else {
    Write-Host "No process found on port 8448"
}