Redirect to http://

After the first WordPress upgrade I have this problem,

mysite/wp-admin with a 302 is redirect to http://www.mysite.com/wp-admin/
and http://www.mysite.com/wp-admin/ with a 302 to http://www.mysite.com/wp-login.php?redirect_to=http://www.mysite.com/wp-admin/&reauth=1

This will heavy slow down my site when I am doing stuff as admin, sometime i get 404 error. This is really annoying.

Please ther’is someone that can point me to the right direction ?

I want to find where this redirect are defined to delete them.

Thank you!