Pointing domain - does not pass the login screen

I have a grafana and accurate server enable an entry from a domain to the public IP grafana, I’m using Grafana 7. In the old server Grafana 5 functioned normally. I have already put the “true allow_embedding” and the pointing work, but does not log in, but if I enter the public IP functions normally, I can access everything. Using domain (http://www.domain.example.com) I put the username and password and not out of the login screen.

I do not know if I’m missing something, I have no experience in Grafana if anyone can give me directions that I follow to be able to put this field. I’m not using NGINX.

Thank you.