Puerto143— IMAP / STARTTLS
IMAP en TCP 143 puede actualizar una conexión mediante STARTTLS si está admitido. Es distinto del TLS implícito del puerto 993.
Registry assignments, software defaults and local listeners are different things. A port number alone does not identify or secure a service.
Configuration and troubleshooting
Haga coincidir el puerto, el modo TLS, el nombre de host y la autenticación del cliente con el servidor. Distinga los errores de negociación TLS de los fallos de inicio de sesión.
Important limitations
No envíe contraseñas sin una conexión cifrada de confianza. Seleccionar el puerto 143 por sí solo no habilita STARTTLS.
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 = :143'macOS
sudo lsof -nP -iTCP:143 -sTCP:LISTENWindows PowerShell
Get-NetTCPConnection -LocalPort 143 -State ListenSources 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 (4 programas)
Community software entries: links are references, not individual verification.
IMAPMail
Internet Message Access Protocol
Recomendaciones de uso
- Antes de utilizar el puerto 143, 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 143 used for?
Port 143 sits in the Email & Messaging 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 143 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 143 is in use?
On Linux: sudo ss -tlnp 'sport = :143' for an exact port match. On macOS: sudo lsof -nP -iTCP:143 -sTCP:LISTEN. On Windows PowerShell: Get-NetTCPConnection -LocalPort 143 -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 143 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
- 143
- Protocolo
- TCP
- Categorías
- Correo electrónico y mensajería
- Estado de uso
- 4 programas que lo utilizan
Puertos relacionados
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