I had same problem, go into control panel:
1. Go to system and secruity
2. Under Windows Firewall, click on "Allow a program through Windows Firewall"
3. Click on "Change Settings"
4. On the side of each program, there are small boxes. Some are selected some are not.
5. Scroll down to all the programs that have the word "Java" in them.
6. Now look at each of the boxes to the LEFT of them.
7. Have everyone of the boxes checked as "yes". It will only be a simple question mark, but you know what i mean.
I really hope this helps. I would love to go on your server and i would love you to come to mine?
Your Welcome! Jack