Fixed it myself, using the following manual override:

ipfwadm -F -a deny -b -P tcp -S 0.0.0.0/0 137:139 -D 0.0.0.0/0 137:139
ipfwadm -F -a deny -b -P udp -S 0.0.0.0/0 137:139 -D 0.0.0.0/0 137:139 

Or at least is seems to work. I have to do some testing from an outside 
line to see if it really does work. The info that helped came from 
www.linuxdoc.org.

Sean


Sean van Koutrik wrote:
> Hi,
> 
> Is it possible to block outgoing traffic? I read that STN by default 
> allows all outgoing traffic.
> My STN gateway is sending netbios packets to the outside world.
> The DNS server of the ISP responds by doing a UDP port probe, which is 
> not blocked by STN but by BlackIce running on my PC.
> Obviously, I'd rather not let them see the outgoing packages .....
> 
> I think Netbios goes out on ports 137 and 138.
> 
> If possible, could you give me an example on the syntax?
> 
> Thanks in advance,
> Sean

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