Here's the issue, which appears unresolved in Panther. I have a DSL connection in my house, with two Macs online 24x7. One Mac is a 1Ghz G4 PM Tower w/896MB running 10.2.8, and the other is a 1GHz G4 iMac w/768MB running 10.3. Both are set to sync with my .Mac account every hour. After four to seven days (never the same on each Mac) I'll get a notice that a .Mac sync effort has failed, so I'll check to see if my DSL connection is still up by having Safari attempt to connect to a website, or whether .Mac was simply down for maintenance. If Safari can't access the web, I'll check Mail as well, to see if I can retrieve new mail. Usually, when Safari is failing, so is Mail and .Mac synching. However, here's the kicker...Internet Explorer continues to access the Internet just fine. My DSL connection remains stable, and if I go to the other Mac it's invariably fine as well, with its Safari/Mail/.Mac access continuing to work. A few days or a week later the other Mac will experience the same issue. This suggests to me that something core to Safari/Mail/.Mac Internet access is failing after a period of time, which is never the same on each Mac. While a simple reboot of the affected Mac restores everything to normalcy, I'd like to resolve the issue, not just live with a work-around. Both Macs are running DHCP and getting their IP addresses from our SpeedStream 5660 DSL Router. Access to other devices/computers on the house LAN remain fully functional. I'm forced to wonder whether something in the webcore that Safari/Mail/.Mac uses, but which Internet Explorer does not, is at fault. What puzzles me is that this issue has been so persistent, and on different Macs, and I've been unable to locate any discussion or reference on the web to others having this problem. Since this problem continues in Panther, I thought I'd post here to see if anyone else is experiencing this issue. So, anyone?