Installation of Loopback Adapter for OBIEE 11g in Windows XP OS

You will need to install Loopback adapter to overcome this password error during the 11g installation. Its a pre-requisite for OBIEE 11g to call the IP of the host file.It is defined that way,you can go through the documentation for it.

Instruction to install Loop Back:

To manually install the Microsoft Loopback adapter in Windows XP, follow these steps:
1. Click Start, and then click Control Panel.
2. If you are in Classic view, click Switch to Category View under Control Panel in the left pane.
3. Double-click Printers and Other Hardware, and then click Next.
4. Under See Also in the left pane, click Add Hardware,and then click Next.
5. Click Yes, I have already connected the hardware, and then click Next.
6. At the bottom of the list, click Add a new hardware device, and then click Next.
7. Click Install the hardware that I manually select from a list, and then click Next.
8. Click Network adapters, and then click Next.
9. In the Manufacturer box, click Microsoft.
10. In the Network Adapter box, click Microsoft Loopback Adapter, and then click Next.
11. Click Finish.

After this go into the network setting and look for the loop back network adaptor and configure it with a static IP address, such as (192.168.1.1) as follow:

After the above step, if the box lost network connection to the rest of the actual network. Then go back and re-configure the Physical Network Adaptor to the way it was (such as DHCP). Because of the Loop Back,the LISTENER.ORA must be updated to reflect the new Static IP address assigned above as part of the Loop Back setup.