Here's a doozy I've been struggling with the last 2 weeks. Just moved into a new place and got the same Time-Warner Internet service as in the old place. Sometimes the connection is very fast, but then at others I cannot even connect to a website. However, at the same time I get nothing in the browser, I can ping the same site with little or no packet loss. Then magically, it will work fine for a few minutes, before dropping out again. I've tried just about everything. I have 3 Macs here (2 Mac Pros and a MacBook Pro). All experience the same problem. Time Warner has been out here 3 times and replaced all the cable and modem/router. They say they've done everything they can do. One of the Mac Pros only has a clean install of SL with no settings changed. All computers have had their wireless and wired tested elsewhere and are working. This happens with safari/chrome/firefox, wired and wireless. I've even booted into boot camp and no luck in windows either. Remember at the same time, I have an genuine IP address from Time Warner and I can ping at will, both to the router and to any URL I like Tried Google DNS Tried fresh install/clean user Here's some more weird stuff: one thing that seems to kill the internet is multiple connections being opened. E.g., multiple tabs or checking mail with mail.app on all 8 email accts or a page with lots of images or flash movies (that is to say, lots of objects to load). I can watch the logs and see that pages with lots of items rarely fully load. two things seem to knock it back online sometimes starting some pings in Network Utility and switching between wired and wireless. Neither always works. while all 3 Macs choke, iPad and iPhone work really fast here! Help!