wine users - Nov 2010 - Application is listen to UDP port but no output

Hello Wine Forum,
I searched some time before i wrote this message, but maybe I just used the
wrong keywords.
I'm running a test version of Win-Test (www.win-test.com) and I tried to run
it in Network with an Windows Laptop. The network communication of this software
is running over udp port 9871. If i send a request from the Laptop to the wine
application i see the correct reaction on the wine screen, but i don't get a
get a feedback on the windows machine.

I used Wireshark to debug the network traffic and i discoverd on eth0 only
traffic from laptop to wine application.

I tried to open the ports with:

Code:
sudo iptables -A OUTPUT -p udp --dport 9871 -j ACCEPT


but the same old story.

Some ideas out there?

Thanks Olli

Me Again,
I tried some stuff with some other software which is using udp with the same
result. I'm guessing its a problem of winsock.

I also send as normal user a udp package from my linux machine to the Windows
laptop with sucess.
Now i know the udp port is able to send data in unix.

With this info somebody may have an idea?

thanks Olli