help with --helper sane

[Mike Wright <mike.wright@mailinator.com>]

Hi all,

I'm trying to make a usb scanner network available using "saned".  The 
machines involved are both running "saned -a".  It works well until I 
turn on iptables on the machine with the scanner.

If I enable firewalling with port 6566 open the scanner initializes but 
never proceeds beyond that point.

I tried these:

-A INPUT -p tcp -m tcp --dport 6566 -m conntrack --ctstate NEW -m helper 
--helper "sane" -j ACCEPT
-A INPUT -p udp -m udp --dport 6566 -m conntrack --ctstate NEW -m helper 
--helper "sane" -j ACCEPT

but that results in "no scanners found".

Using CUPS as an example I did this on both sides and didn't have any 
luck that way either.

Sorry if I can't better describe this.  I've never used a scanner over 
the net before and netfilter's helpers are new to me.  Google finds many 
references to iptables and sane, but only in the context of sanity, 
which I am quickly losing ;D

Any helpers?

TIA,
Mike Wright