ok have WPMS installed and working with domain mapping. Now

Hi, ok have WPMS installed and working with domain mapping.

Now i have setup a domain redirect for domain i have so it point to main domain on this wpms install. It redirects ok, but when loading it site it tries to load the wp-signup.php ?

Not sure if this a redirect issue or a WP issue?

main wpms domain is
innesphotography.co.uk

the redirected domain is

innes.photography

any ideas ?

thanks