gitlab 8.6.5 returns 404 when accessing admin page. Please help!!!!!!

Summary

We use GitLab EE installed with docker image (gitlab/gitlab-ee:8.6.5-ee.0) We have just update the GitLab from version 8.2.0 to 8.6.5

First time we log in to GitLab with admin account we can see the right upper cornet the link to admin page

After 1 hour the admin link is gone and if we try to access the admin page we get 404

NOTE: We use LDAP

Steps to reproduce

Install the gitLab with docker gitlab/gitlab-ee:8.6.5-ee.0 Access the admin page with admin account After 1 hour refreshing the admin page returns 404 and the admin page link is gone

Issue very critical since we cannot access admin page

Please help!!!

Thanks

Regards

Alberto