Port 1723 · PPTP

Port 1723 is PPTP, TCP.

Point-to-Point Tunneling Protocol — legacy VPN. MS-CHAPv2 authentication is cryptographically broken. Avoid.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service tcp-1723 protocol tcp port 1723

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application pptp service tcp-1723 action allow

Risk and exposure

Rated high risk. Services on this port are commonly targeted by attackers. Keep it off the internet, or put it behind a VPN or a strict source allow-list, and monitor access.

Check it

• Linux ss -tlnp | grep :1723
• PowerShell Test-NetConnection <host> -Port 1723
• nmap nmap -p 1723 <host>

Related ports

• 23 Telnet
• 500 IKE / ISAKMP
• 1194 OpenVPN
• 1701 L2TP
• 1812 RADIUS Auth
• 4443 GlobalProtect HTTPS

← Search all ports