Port 1723: PPTP
Legacy VPN protocol.
- Port
- 1723
- Protocol
- TCP
- Service
- PPTP
- Exposure
- Do not expose to the internet
What is port 1723 used for?
Old remote-access VPNs.
Is it safe to expose port 1723 to the internet?
PPTP is cryptographically broken. Replace it with IPsec or WireGuard.
If port 1723 seems closed or unreachable
- Check that the PPTP service is running and listening on port 1723, not only on 127.0.0.1.
- Check the firewall on the host itself (Windows Defender Firewall, iptables, nftables, ufw) for a rule that allows TCP 1723.
- If the host is behind a router, confirm the forwarding rule points to the correct internal address and that your internet provider does not use carrier-grade NAT.
- Test from outside your own network. A port can be open locally and blocked at the edge, or the other way round.
Using port 1723 safely
Treat port 1723 as an internal-only service. Reach it through a VPN or an SSH tunnel, restrict it by source address, and keep the software that listens on it patched.
Check whether port 1723 is open on your host
The check connects from our server, so it shows what the internet can reach.
Open the port checker