Frustration! I've installed ISA 2004 evaluation on a SBS 2003 machine. The server has one NIC for the local network and connects to the internet using a BT Voyager 100 DSL modem. Technically this (I believe) is a dial-up connection, since it has to be initiated to connect the modem.
I can initiate a connection manually on the server, and the connected machines can see the internet and my access rules and policies are enforced.
However, when the modem is not connected and I try to access the Internet from a workstation, ISA will not dial a connection automatically, and after a time-out period I get a DNS-related message saying that the website cannot be found.
However, when I go to the SBS server and connect manually, the workstation can get access.
The SBS 2003 box is the only server in a small network, and controls DNS, DHCP and all related services.
I've successfully configured ISA 2000 on larger networks in the past, but this is my first time with 2004 and a DSL modem.