new site redirects to default control panel webgpage

i have wordpress install on my main domain with few contents..lately i decided to enable multisite..i have successfully do it until the last option of creating a wildcard domain..however,subsites redirects me to default controlpanel webpage if i view my subsite as subsite.mainsite.com but if i view my sample post from subsite dashboard it works fine (http://subsite.mainsite.com/sample-page/)—works fine
(http://subsite.mainsite.com/2014/02/01/hello-world/)–works fine
but
http://subsite.mainsite.com redirects to http://subsite.mainsite.com/cgi-sys/defaultwebpage.cgi