I found it necessary to troubleshoot a problem enabling kerberos to modify the ambari server and cluster boxes /etc/hostname from name.example.com to name.corp.example.com I also edited the /etc/hosts on all to reflect accordingly. I also ran ambari-server setup-security and option 1 to DISABLE the https. Enter choice, (1-5): 1 Do you want to disable HTTPS [y/n] (n)? y Ambari server URL changed. To make use of the Tez View in Ambari please update the property tez.tez-ui.history-url.base in tez-site Adjusting ambari-server permissions and ownership... NOTE: Restart Ambari Server to apply changes ("ambari-server restart|stop+start") restarted the ambari service #ambari-server restart| Now I get the login page on port 8- butif I try to login as admin the screen just freezes and mouse cursor becomes circle with line through it. Any suggestions welcome to get back to admin able to log in. ... View more