Port 1723 — PPTP
Quick reference for TCP/UDP port 1723, used by PPTP. Includes what the service does, security guidance and related ports.
What is port 1723?
Point-to-Point Tunneling Protocol. Considered insecure.
What port does PPTP use?
PPTP listens on port 1723 by default.
Is port 1723 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 1723
Test-NetConnection HOST -Port 1723
nmap -p 1723 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
High risk — do not expose to the internet
Port 1723 (PPTP) 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 1723 used for?+
Port 1723 is the standard TCP/UDP port for PPTP. Point-to-Point Tunneling Protocol. Considered insecure.
What port does PPTP use?+
PPTP listens on port 1723 by default.
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