Port443— HTTPS
HTTPS utilise normalement le port 443. HTTP/1.1 et HTTP/2 utilisent généralement TCP/TLS ; HTTP/3 utilise QUIC sur UDP, donc TCP seul ne couvre pas tous les déploiements.
Registry assignments, software defaults and local listeners are different things. A port number alone does not identify or secure a service.
Configuration and troubleshooting
Vérifiez les adresses d’écoute, les noms d’hôte des certificats et les chaînes de certificats. Si HTTP/3 est activé, vérifiez aussi l’écoute UDP, le proxy et le passage du pare-feu.
Important limitations
Un port accessible ne garantit pas la fiabilité du certificat. Ne contournez pas durablement les vérifications de certificat ; un échec de HTTP/3 n’implique pas nécessairement un échec de HTTPS sur 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
Logiciels utilisant ce port (9 logiciels)
Community software entries: links are references, not individual verification.
Conseils d’utilisation
- Avant d’utiliser le port 443, vérifiez qu’il n’est pas occupé par d’autres services
- En cas de conflit de ports, envisagez d’utiliser d’autres ports ou d’arrêter le service qui occupe le port
Questions fréquentes
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.
En bref
- Port
- 443
- Protocole
- TCP/UDP
- Catégories
- Web et services HTTP
- État d’utilisation
- 9 logiciels utilisant ce port
Ports associés
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