I’m having the same problem as robpannell – but only after I changed the site from non-www to www. The site is up, the admin works but the network admin goes into the infinite loop. If I remove the DOMAIN_CURRENT_SITE, then the network admin works but then none of the site links work(but the site is visible). I have two databases I’m flipping between to figure this out -one with all the links set to non-www and one with all www. I’m guessing there’s a mismatch somewhere between non-www and www but don’t get where when it only affects network admin?