@raouia Your command is correct. It should work without any issue. I tested the same as following: Example: curl -i -u admin:admin -H "X-Requested-By: ambari" -X PUT -d '{"Users": { "user_name": "admin", "password": "admin_new_pwd", "old_password": "admin"}}' http://blueprint.example.com:8080/api/v1/users/admin . Here blueprint.example.com: is my Ambari Server Hostname admin: is the ambari user name admin: is old password (If you want to change any other user password then please make sure that you enter admin password only here as this is the password of the admin user. Only Admin user can change password of other users) admin_new_pwd: is the new admin user password. Output: # curl -i -u admin:admin -H "X-Requested-By: ambari" -X PUT -d '{"Users": { "user_name": "admin", "password": "admin_new_pwd", "old_password": "admin"}}' http://blueprint.example.com:8080/api/v1/users/admin HTTP/1.1 200 OK X-Frame-Options: DENY X-XSS-Protection: 1; mode=block X-Content-Type-Options: nosniff Cache-Control: no-store Pragma: no-cache Set-Cookie: AMBARISESSIONID=1uldktxnl7c1xfgbfx878sows;Path=/;HttpOnly Expires: Thu, 01 Jan 1970 00:00:00 GMT User: admin Content-Type: text/plain Content-Length: 0 ... View more