> but going to <http://linux:8080/> in Konqueror has the 
same
> result.

Apparently there's a problem in your DNS (internet name 
resolver) and/or your machine name: the system finds the 
name "linux" as machine name, but this name is not 
resolvable.

Try this in a console:

hostname
ping linux

or:

ping `hostname`

The ping commands should work properly.