What is the default Ranger admin username and password for hortonworks/sandbox-hdp:3.0.1

[#1]

Hello,

I use hortonworks/sandbox-hdp:3.0.1 and hortonworks/sandbox-proxy:1.0. as a docker containers. Tried to connect to ranger using admin/admin however without any success - The username or password you entered is incorrect. Tried to change ranger password in the Ambari here - Ranger Admin user's password for Ambari

and here

and was not able to login to the Ranger using new passwords. Now I also have Ranger Admin password check alert.

Please clarify the default username and password for Ranger or provide me with steps how can I change it.

P.S. have ranger access as a maria_dev user and can not logging to MySQL DB as a root to try to reset current Ranger password