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Puerto515— LPD / line printer daemon

TCPSistema

TCP 515 corresponde al protocolo LPD (line printer daemon), heredado de Unix y conservado para impresoras antiguas y servidores de impresión empresariales. Los nuevos despliegues deberían preferir IPP (631) o raw jetdirect (9100).

Registry assignments, software defaults and local listeners are different things. A port number alone does not identify or secure a service.

Configuration and troubleshooting

Si falla la impresión LPD, confirme que cups-lpd esté funcionando: proporciona el servicio LPD, normalmente activado por xinetd o una unidad socket de systemd. Haga coincidir el nombre de cola del cliente (`lp -d`) con la impresora y permita TCP 515. Para colas atascadas, `lpstat -o` enumera los trabajos y `cancel -a` los elimina.

Important limitations

LPD no tiene autenticación ni cifrado, y sus implementaciones acumulan un largo historial de vulnerabilidades. Manténgalo en LAN de confianza; para imprimir entre redes use IPPS (631 con TLS).

Read-only checks: run on the server host

Choose the commands for your OS. Check TCP and UDP separately. No result is not a lasting availability guarantee; inspect host and container separately.

Linux

sudo ss -ltnp 'sport = :515'

macOS

sudo lsof -nP -iTCP:515 -sTCP:LISTEN

Windows PowerShell

Get-NetTCPConnection -LocalPort 515 -State Listen

Sources and review

Sources checked on:

This review covers the explanations and sources on this page, not your device or every community software entry below.

Software que utiliza este puerto (2 programas)

Community software entries: links are references, not individual verification.

LPD (Line Printer Daemon)

Printing

CUPS Print Service

UnixPrintingSystemLPDProtocol

Reference link ↗

Recomendaciones de uso

  • Antes de utilizar el puerto 515, comprueba que no esté ocupado por otros servicios
  • Si encuentras conflictos de puertos, considera utilizar otros puertos o detener el servicio que lo ocupa

Preguntas frecuentes

What is port 515 used for?

Port 515 sits in the System category. This page lists the registered purpose and the software commonly associated with it; to see what is actually listening on a specific machine, check the process with ss/netstat.

Is port 515 TCP or UDP?

The registered protocol on this page is TCP. The same number behaves independently on each protocol: TCP may be listening while UDP is idle, so check them separately.

How do I check if port 515 is in use?

On Linux: sudo ss -tlnp 'sport = :515' for an exact port match. On macOS: sudo lsof -nP -iTCP:515 -sTCP:LISTEN. On Windows PowerShell: Get-NetTCPConnection -LocalPort 515 -State Listen. A listener counts as confirmed only when you can see the bind address and process name; without root/admin you will not see other users' processes.

Is port 515 secure? Should I open it in my firewall?

A port number has no inherent security — it depends on whether the listening service is correctly configured and whether it needs exposure at all. Keep loopback/internal-only services firewalled; where public access is required, pair it with source restrictions, VPN or authentication. The caution section on this page lists port-specific risks.

Información rápida

Puerto
515
Protocolo
TCP
Categorías
Sistema
Estado de uso
2 programas que lo utilizan

Puertos relacionados

Puerto 631TCP
Puerto 9100TCP

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