GO2CALL and firewall

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Quick overview.  I'm having a bit of trouble with my WIN2K machine (IP 192.168.1.14 on my home network) to work with GO2CALL.  I'm behind a Linux firewall running IPCHAINS to masq the backend of the network. Chain rules:
 
:input ACCEPT
:forward DENY
:output ACCEPT
-A forward -s 192.168.1.0/255.255.255.0 -d 0.0.0.0/0.0.0.0 -j MASQ 
 
I'm also doing portforwarding with the following rules:
 
/usr/sbin/ipmasqadm portfw -a -P tcp -L firewall's.incoming.ip.address \ 2090 -R 192.168.1.14 2090
/usr/sbin/ipmasqadm portfw -a -P tcp -L firewall's.incoming.ip.address \ 2091 -R 192.168.1.14 2091
/usr/sbin/ipmasqadm portfw -a -P udp -L firewall's.incoming.ip.address \ 2090 -R 192.168.1.14 2090
/usr/sbin/ipmasqadm portfw -a -P udp -L firewall's.incoming.ip.address \ 2091 -R 192.168.1.14 2091
 
where firewall's.incoming.ip.address is the outside NIC of the firewall and 192.168.1.14 is the IP of my WIN2K workstation.
 
/usr/sbin/ipmasqadm portfw -ln reports:
 
prot    localaddr      rediraddr        lport rport pcnt pref
UDP    firewall ip    192.168.1.14    2091  2091  10  10
UDP    firewall ip    192.168.1.14    2090  2090  10  10
TCP    firewall ip    192.168.1.14    2091  2091  10  10
TCP    firewall ip    192.168.1.14    2090  2090  10  10
 
I've successfully used DIALPAD.COM doing autoforwarding using these rules which work fine:
 
/usr/sbin/ipmasqadm autofw -A -v -u -r udp 51200 51201 -c tcp
7175 /usr/sbin/ipmasqadm autofw -A -v -u -r tcp 51210 51210 -c tcp 7175 
 
Anyone got any ideas why GO2CALL.COM won't work?  I'd really
appreciated it.  Thanks,
 
-- laetus
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