Eugene Gorbunoff has put up an update for the firewall feature which is built into the Multi-Protocol Transport Services version 5.3 (WRx8600) and above. This appears to only be available to Software Subscription Service customers only.
FirewallPortsSetup-20080930.zip 112 kb 30/09/2008 03:42 pm Firewall ports setup
From: Mark Dodel
Source: OS2VOICE.org