So I set up a self-service platform needs ipmi opened controller, then this has been an error:
[root@localhost ~]# ipmitool -H 172.16.90.x -I lanplus -U root -P SZtx@2013 power reset Error: Unable to establish IPMI v2 / RMCP+ session
In fact, there is a communication problem, I checked on the controller ping this machine is on, you can log normal account password is not unusual character;
Solution:
My machine is DELL R620
The configuration can be modified idrac:
