In case anyone else needs this: xp_fw_fix.bat

echo off
REM ====================================================
REM Copyright 2004: Christopher Jay Manders
REM Chris.Manders AT UnixHelpDesk DOT COM
REM Version: 1.0
REM ----------------------------------------------------
REM  Description:
REM This .bat file is intended for Windows XP (with SP2)
REM It allows backups to pass through the firewall for 
REM backup services.
REM ====================================================
set allowed_subnets="1.2.0.0/16,1.2.0.0/16"
echo.
echo Configuring The Windows XP Firewall for LBNL BackuP Services...
echo.
netsh firewall set portopening TCP 13782 "bpcd - Backup Service" enable custom 
%allowed_subnets% > NUL 2>&1
netsh firewall set portopening TCP 13720 "bprd - Backup Service" enable custom 
%allowed_subnets% > NUL 2>&1
echo.
REM ===============================================================
echo Done.
pause