So at exactly 10 am & 10 pm every single day you will block/unblock the ports? I should imagine that will become tedious. The port LW normally uses is port 6346. However they may well change the port within their program so I suspect that will not be the answer. Another answer might be LimeKill which was designed by an Australian. Look over at the General Gnutella Development Discussion forum section & you'll find it. It would be possible to set it to run at certain times I should imagine. Particularly using applescript or another utility/system timing setting. If you know how to use applescript then it should be easy for you.