Should port 1701 be open on my firewall?

Port 1701 is generally safe to have open. Apply standard security practices: keep software updated and monitor access logs.

What transport protocol does port 1701 use?

Port 1701 (L2TP) uses the UDP transport protocol and falls under the Security & VPN category.

:1701 (UDP)

L2TP

Q: Is port 1701 (L2TP) dangerous?

Port 1701 is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose with standard security practices.

Low Risk

UDP — Security & VPN

Port Overview

Port Number 1701

Service Name L2TP

Transport Protocol UDP

Category Security & VPN

Security Risk Low

Port Range Registered (1024-49151)

What is Port 1701?

Port 1701 is the standard port for Layer 2 Tunneling Protocol (L2TP), used to create VPN tunnels. L2TP itself provides no encryption and is typically combined with IPSec to form L2TP/IPSec VPN connections. It is built into Windows, macOS, iOS, and Android for VPN connectivity.

UDP Security & VPN Commonly Used

Security Considerations

Port 1701 (L2TP) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.

Recommendation: Standard security practices apply. Keep software updated and monitor access.

Related Ports — Security & VPN

31 MSG-AUTH 48 Auditd 49 TACACS 56 XNS-AUTH 62 ACA Services 65 TACACS-DS 88 Kerberos 90 DNSIX Security

Related Terms

SSL/TLS Certificate DDoS DNS Spoofing Encryption Firewall HTTPS