Port forwarding and local firewall connections

Hello.

This is the network:

LAN (10.10.10.0/24) <-> (10.10.10.12) FW (192.168.10.1) <->
(192.168.10.2) webserver

I have set up a firewall who redirects some ports to another
server in che DMZ with iptables:

iptables -t nat -A PREROUTING -i ! $DMZIF -p tcp --dport 80 -j
DNAT --to 192.168.10.2
iptables -A FORWARD -p tcp -d 192.168.10.2 --dport 80 -j ACCEPT

Everything works correctly from the LAN, PCs can connect to
webserver and it replays, but if on the firewall i try to
connect to http://10.10.10.12 don't works, it says connection
refused.

Can anyone help me please? Thank you!

--
mandi, Marco