Cannot Log in to my new mapped site

Hi,
I am using Multi-Domain and Domain mapping plugins
I already configure them
I have a domain "micoachdeVida.com" this is the TLD
I have registered "todopormishijos.com" as a domain for a site blog that belongs to the network "micoachdevida"

So I created a site "www.todopormishijos.com" and mapped domanin "todopormishijos.com" to that blog

The trouble is that I cannot access the dashboard on my new site.
I typed the username and the pwd... and allway redirects me to the login page.

If I Create a subdomian blog in domain "micoachdevida" it works perfectly...

But for a that new domain "todopormishijos.com" I cannot access the admin area...