I have the same problem s that you have. I run Mac OS 9.1 and a couple of weeks ago I installed 2.4. It ran for a week then it stopped connecting.I checked with ISP and they are not blocking it.This is on DSL.I can connect Limewire to same ISP on the dial-up that they provide for back-up.I also can't figure it out.Just keep reading these posts till I find sumthin that works.Good luck