I try to be more specific. I can see the network of sites when I try to modify any site, ask me for the password on the main site (the correct redirection appears in the address bar) but I always sent to the main site. Even from the subdomain. I accede to: en.xxxx.xxx/wp-admin and this redirects me to the login page of the main site. Pulse subdomain dashboard, this asks for my login and open the main site dashboard. I hope your help thanks