More linksys pants equipment.

Decided I’d have a go at setting up the linksys wag54g. At first glance it all seemed to work on on the lan side (I’ve not yet plugged it into the telephone line) I upgraded the firmware, or tried to. As the upgrade process got to 100% of the bar across the screen, internet explorer then refreshed to a 404. When I closed the browser down and opened it up again it came up with a successful upgrade process. (weird).
Now though, whenever I connect to the lan interface it comes up with “Cannot find server” even though I can ping it.