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Though it can be configured to run on any port OpenVPN runs best on a UDP por tUDP does not allow the recipient to acknowledge receipt of the data or request information to be resent This allows UDP to establish connections and transfer data faster

This article provides information about the ports that are used for a Virtual Private Network VPN

Symptoms

Environment

Autokey IKE

NET Screen Remote VPN Client behind another firewall

Symptoms and errors:

Ports required for IPSec

Ports need to be open on the firewall to allow IPSec or VPN through

Solution

Internet Protocol Security IPSec  uses IP protocol 50 for Encapsulated Security Protocol

ESP IP protocol 51 for Authentication Header (AH), and UDP port 500 for IKE Phase 1 negotiation and Phase 2 negotiations. UDP ports 500 and 4500 are used if NAT T is used for IKE Phase 1 negotiation and Phase 2 negotiations

Secure Sockets Layer SSL uses TCP port 443 and works by using a private key to encrypt data that is transferred over the SSL connection. SSL also uses 465 Secure SMTP 993 Secure IMAP and 995 Secure POP

Layer Two Tunneling Protocol (L2TP) uses UDP port 1701 and is an extension of the Point to-Point Tunneling Protocol. L2TP is often used with IPSec to establish a Virtual Private Network VPN

Point to Point Tunneling Protocol (PPTP) uses TCP port 1000 and IP protocol 47 Generic Routing Encapsulation (GRE) PPTP provides a low-cost, private connection to a corporate network through the Internet. PPTP works well for people who work from home or travel and need to access their corporate networks. It is often used to access a Microsoft Remote Access Server

RAS

Modification History

​ Article reviewed for accuracy No changes made Article is correct and complete

Fixed typo corrected to IP Protocol 47

Fixed typo that L2TP uses UDP not TCP

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