You need to open port 2319 TCP and UDP for Dream Match Tennis.
First we need to find your IP address.
For Windows XP: Click Start and then Run .

In the Run Command you write : cmd.
And push : OK

For Windows Vista/ Windows 7: Click Start and write in the search box : cmd.
And push ENTER

Once you're done with that either in Windows XP or Vista . You will have a black Command Prompt window (cmd) .
In the Command Prompt window write down : ipconfig
And push ENTER

You will now see your IPv4 address or IP Address , which is basicly the same.
IPv4.

IP Address.

Now go to your modem or router and look for the name and model which you most probably will find at the bottom of your machine


Go to to this link: http://www.portforward.com .

Scroll down the page and look for the name of your modem or router

Click to skip add.


Scroll down and click on Dream Match Tennis .

Enter you IPv4 or IP address

Just follow the steps that are shown to you on this page
At the end it should look something like this for this particular modem

Hope that everything was clear and if you have any question just contact me