Snow Leopard Ethernet Problem
I just installed Snow Leopard on my iMac and have experienced an ethernet problem with Safari, Firefox, Mail and Thunderbird; these applications work for about 1 hr. and then the applications will lose the ethernet connection even though System Preferences/Network shows that ethernet is connected. However, Skype works (no connection loss) while the aforementioned applications have lost their connections. This problem keeps recurring intermittently (approx every 1hr.
As a work-around to the problem, I go into System Preferences/Network/Configure IPv4: choose OFF in the drop-down, click on APPLY. Then in the same drop-down, select "Using DHCP", click on APPLY and wait for an IP Address to be reassigned. After this procedure, the applications that lost the ethernet connection will start functioning again.
I am using a Linksys Router, DHCP with a 1 giga-bit connection, CAT5.