My version is 10.3.7, I think that's the newest. I'm using OSX's built-in firewall with port 6346 open, and I'm not using any other software firewalls.
Ram is a GB, and i have about 50 GB free on my hard drive.
I'm on the network here at school, so I'm not using a modem. I'm using a Lynksys router, model # befsr41 v.3
Hope that helps. Thanks.