Can’t login normally

For some strange reason I can’t log in using /wp-admin after my url. The weird thing is that I’m being redirected.
Example- I type>>> http://internetafiliado.info/wp-admin and when I hit enter this happens>>> http://internetafiliado.info/wp-login.php?redirect_to=http%3A%2F%2Finternetafiliado.info%2Fwp-admin%2F

I have no idea what is causing it and this happened to all my blogs under the same server. I can login using the log out url >>>> http://internetafiliado.info/wp-login.php?loggedout=true

Any idea why this could be happening?

Thanks