Thanx Bekham for your reply. I got the solution and reset the password through GRUB menu. Here is the solution.
1. Boot the virtual appliance and navigate to the console for the virtual machine in the vSphere Client.
2. Click in the console and press any key to display the GRUB menu.
Note: The GRUB prompt remains on screen for 7 seconds before it starts the boot sequence.
3. On the GRUB menu, select “.
4. Type to edit the line. A list of items in the GRUB configuration file appears.
5. Select the line that starts with and type to edit the line.
6. At the end of the line, press the spacebar and type .
7. Press Enter to exit edit mode.
8. On the GRUB screen, type to boot into single-user mode.
The virtual appliance boots in single-user mode.
9. To change the root user password, type and follow the on-screen prompts.
10. To restart the virtual appliance, type and press Enter.
When the virtual appliance restarts, you can log in using the new password.
that is different password not the SSO webclient Glad that you got the solution.