Supermicro provides a tool for you to manage your IPMI settings named IPMICFG. You can download it from the following location.
It contains tools for DOS, Linux, and Windows.
If you have Linux installed on that server, you can install OpenIPMI and IPMI Tool to manage the local or remote IPMI service.
To reset the password, all you have to do is as follows.# service ipmi restart
If IPMI service could not be started, please stop here.
You might not have IPMI support in your server.
First, you have to get the user id of the account "ADMIN".
You might see the output as above with the user id of account "ADMIN" is 2.
Now, you change the password of user with id = 2 to "MATKHAU", for example.
That's all. Have a nice try!