> The page contains however in the main a list of  30
> websites, indirectly addressed through ASP. 

Redirects are not followed by default. You have to list the 
30 sites, and add the corresponding scan rules in 'Set 
options'/'Scan rules'

Example:

+www.example.com/*
+www.foo.com/*
+www.bar.com/*
+www.foobar.com/*
+www.baz.com/*
..