I have multisite set up with a copy of the original site at http://sportsweek.fantasysports.co.uk. I have then set up a domain map for this sub-domain at sportsweek.co.uk. The backend works fine at http://sportsweek.fantasysports.co.uk. However the frontend is redirecting to fantasysports.co.uk for the home page and to another domain (apat.com) for all other pages and posts - For example if the page should be http://sportsweek.co.uk/members/ it redirects to a 404 on apat.com (presumably it is looking for apat.com/members although the URL remains http://sportsweek.co.uk/members/ in the browser). apat.com has the same IP address as fantasysports.co.uk (126.96.36.199) which is what I have entered in the 'Server IP Address:' under the 'mapping options' tab.