The default user and password of ILOM is “root/changeme”, but if you hv changed the password already and due for some reason you forgot the password, here are the step by step to revocer the ILOM password.

First of all, try to change the password with ipmitool, but if its still doesn’t work, try below step:

Notes:
– You must be physically present at the server to perform this procedure.
– This procedure uses the default user account to enable you to recover a lost password or to re-create the root user account.
– You cannot change or delete the default user account.

1. Connect to ILOM via serial console and log in using the default user account.
SUNSP-xxxxxxxx login: default
Press and release the physical presence button.
Press return when this is completed…

2. Prove physical presence at your server.
Press and release the physical presence button.

The Physical Presence button on the Sun SPARC Enterprise T5xxx servers and X-Series is the Locator button:

But, for Sparc T3/T4 model, the physical presence are on rear side, except for T3-1b/T4-1b:
SPARC T3-1/T4-1: (rear) pin-hole to the left of the USB ports
SPARC T3-2/T4-2: (rear) pin-hole to the left of NET0
SPARC T3-4/T4-4: (rear) to the right of OK LED, above the USB port
SPARC T3-1b/T4-1b: (front) Locate button/Physical Presence (White LED)

3. Return to your serial console and press Enter.

You will be prompted for a password.

4. Type the password for the default user account: defaultpassword

5. Reset the account password or re-create the root account.

-> set /SP/users/root password
Enter new password: ********
Enter new password again: ********

6. Type “exit” to leave default login
7. try login with your new root password

—————-

Update for The “Physical Presence” button locations by server:

Physical Presence for SPARC T4-1 : rear, pin/hole between net3 and usb0 (red circle)

NOTES
– T7-x, S7-x and all platforms forward should use the Locator button (front/rear) as the Physical Presence switch
– To perform some procedures documented in the Oracle ILOM core documentation, you must create a serial connection to the server and activate the Physical Presence switch on the server. For information about creating a serial connection, refer to the installation guide for the server.
– If the physical presence/locator button is not working and/or can not be located, then as temporary workaround the physical presence check can be disabled:
– -> show /SP check_physical_presence
– -> set /SP check_physical_presence=false
– -> show /SP check_physical_presence
and it can be later enabled
– -> show /SP check_physical_presence
– -> set /SP check_physical_presence=true
– -> show /SP check_physical_presence
– For more information look at the documents below:
– T Series Server Documentation
– Oracle Integrated Lights Out Manager (ILOM) 3.x Documentation

If you have MOS access, read more on doc : 1509660.1

Oracle Support Document 1509660.1 (How to locate the “Physical Presence” button on SPARC T3-x, T4-x, T5-x, T7-x, S7-x Servers)

https://support.oracle.com/epmos/faces/DocumentDisplay?id=1509660.1