No connection to server

[ale]

I have two laptops (Win7 and Vista). Ports are opened and program allowed through the firewall. Router configured accordingly. Vista laptop says "No connection to the server", Win7 works fine (by the way Beta version has sound issues, if anyone has noted). Test connection gives following:
1. firewall blocking the voip traffic between freephoneline and the server.
2. The sIP traffic is filtered for your inet connection
3. Ports 6060 13000 are used by another application.

My question are;
1. how I can see wich application is using the ports?
2. how to disable filtering of sip traffic
3. how to unblock programs if they are unblocked?

Thank you!