I have started a new thread since I have new updates on the matter:
previous thread: http://wordpress.org/support/topic/404-found-after-clicking-on-set-primary-domain?replies=2
I have tested again with the same result of the previous thread but this time with different conditions..
I try a blank install.. after doing that I have redirected 2 domains to google.. waited for the dns to propagate.. once the redirection took effect..I change the DNS to point to my server again.. I waited until the propagation took effect..
I applied changes again to the new sites in the mappin options..
When trying from 0 the first domain was parked tuafrodita.tk it worked.
when trying the same for aztekaoc.tk it failed... 404 error... port 80..
has anybody encountered the same issue? please some help!