Port 1701 — L2TP
Quick reference for TCP/UDP port 1701, used by L2TP. Includes what the service does, security guidance and related ports.
What is port 1701?
Layer 2 Tunneling Protocol.
What port does L2TP use?
L2TP listens on port 1701 by default.
Security guidance
High risk — do not expose to the internet
Port 1701 (L2TP) is high-risk because the service it carries is a frequent target for credential attacks, brute force or unpatched-vulnerability scanning. Keep it bound to localhost or your VPN, never forward it directly on a router, and require strong authentication.
Related ports
Frequently asked
What is port 1701 used for?+
Port 1701 is the standard TCP/UDP port for L2TP. Layer 2 Tunneling Protocol.
What port does L2TP use?+
L2TP listens on port 1701 by default.
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