Firewall Documentation for the MPTS firewall & VPN feature has been updated (5/11/2005) to version 1.4. This INF document describes how to configure and use the powerful built-in firewall feature with support for IP packet filtering and IPSec VPN tunnels that have been included in TCP/IP v4.1 and above.
http://www.cs-club.org/~alex/os2/firewall.html
Source: OS/2 News and Rumors