When you don't know the username and password or you need to change them, you can use IPMITool to perform this task along with other user management tasks from an SSH terminal windows, like PuTTY.
Listed below are the user management commands I found helpful.
Command:
ipmitool user list 2
Example:
[root@APPLIANCE14 ~]# ipmitool user list 2
ID Name Callin Link Auth IPMI Msg Channel Priv Limit
2 root true true true ADMINISTRATOR
Command:
ipmitool user enable 2
Example:
[root@APPLIANCE14 ~]# ipmitool user enable 2
Command:
ipmitool user disable 2
Example:
[root@APPLIANCE14 ~]# ipmitool user disable 2
ipmitool user set password 2 <Password>
Example:
[root@APPLIANCE14 ~]# ipmitool user set password 2 themaster01
Rename the iDRAC Root User
Command:
ipmitool user set name 2 <newusername>
Example:
[root@APPLIANCE14 ~]# ipmitool user set name 2 bueno
[root@APPLIANCE14 ~]# ipmitool user list 2
ID Name Callin Link Auth IPMI Msg Channel Priv Limit
2 bueno true true true ADMINISTRATOR
[root@APPLIANCE14 ~]# ipmitool user set name
User Commands: summary [<channel number>]
list [<channel number>]
set name <user id> <username>
set password <user id> [<password>]
disable <user id>
enable <user id>
priv <user id> <privilege level> [<channel number>]
test <user id> <16|20> [<password]>
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