Can't access dashboard to additional sites…

Hi there,

I’ve installed WordPress, activated multisites, added an additional site… I can “view the front end” of the additional site, but get an error when trying to access the wp-admin dashboard of the additional site… so going to http://mysite.com/addonsite the site displays as expected in the browser… but when I try to view the dashboard of this site I get an error ( going to http://mysite.com/addonsite/wp-admin/ )
gets me an error “The page isn’t redirecting properly.
Firefox has detected that the server is redirecting the request for this address in a way that will never complete.”

any ideas??

thx