Puerto443— HTTPS
HTTPS normalmente usa el 443. HTTP/1.1 y HTTP/2 suelen usar TCP/TLS; HTTP/3 usa QUIC sobre UDP, por lo que TCP por sí solo no cubre todos los despliegues.
Registry assignments, software defaults and local listeners are different things. A port number alone does not identify or secure a service.
Configuration and troubleshooting
Compruebe las direcciones de enlace, los nombres de host de los certificados y las cadenas de certificados. Si HTTP/3 está habilitado, verifique también el socket UDP, el proxy y la ruta del cortafuegos.
Important limitations
Que un puerto sea accesible no demuestra que el certificado sea de confianza. No omita permanentemente su validación; un fallo de HTTP/3 no implica necesariamente un fallo de HTTPS sobre TCP.
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 = :443'
sudo ss -lunp 'sport = :443'macOS
sudo lsof -nP -iTCP:443 -sTCP:LISTEN
sudo lsof -nP -iUDP:443Windows PowerShell
Get-NetTCPConnection -LocalPort 443 -State Listen
Get-NetUDPEndpoint -LocalPort 443Sources and review
Sources checked on:
This review covers the explanations and sources on this page, not your device or every community software entry below.
Related troubleshooting guides
Software que utiliza este puerto (9 programas)
Community software entries: links are references, not individual verification.
Recomendaciones de uso
- Antes de utilizar el puerto 443, 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 443 used for?
Port 443 sits in the Web & HTTP Services 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 443 TCP or UDP?
The registered protocol on this page is TCP / UDP. 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 443 is in use?
On Linux: sudo ss -tlnp 'sport = :443' for an exact port match. On macOS: sudo lsof -nP -iTCP:443 -sTCP:LISTEN. On Windows PowerShell: Get-NetTCPConnection -LocalPort 443 -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 443 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
- 443
- Protocolo
- TCP/UDP
- Categorías
- Servicios web y HTTP
- Estado de uso
- 9 programas que lo utilizan
Puertos relacionados
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