Grafana user dont work with reverse proxy header and LDAP

Grafana: 6.0.2
OpenLdap: 2.4.47
OS: Ubuntu 16.04
Nginx: 1.15.8

PROBLEM:
proxy_set_header X-WEBAUTH-USER UserName;

EXAMPLE:

  • admin (Grafana)
  • User_1 (Grafana)
  • User_2 (LDAP)

All users loggin from the loggin page, but only User_2 can login with X-WEBAUTH-USER after configure LDAP