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When I try to renew an IP address I get this message

C:\>ipconfig /renew

Windows IP Configuration

An error occurred while renewing interface Local Area Connection : The RPC server is unavailable.

How can I solve this problem?

After googling I found that is caused by a file named iKernel.exe is missing.
This problem can be solved by just copy back this execute file to the path.

Solution:
1. Copy a iKernel.exe file from any computer and then paste to below location
C:\Program Files\Common Files\InstallShield\Engine\6\Intel 32\
2. Reboot your computer.
3. Done.

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I had forgotten one of my Red Had Enterprise Linux 5 server’s root password.
What can I do? How can I retrieve or reset the root password?
After googling and tried one of the solutions.
My problem was solved.

The solution is boot into single-user mode from GRUB and then change the root password.

Below is the steps to reset root password.

1. Reboot your workstation, wait until the GRUB menu screen come out.
2. Select the desired kernel you want.
3. Press the ‘e‘ key to edit that entry.
4. Use the arrow keys to navigate to the kernel line
(for example: kernel /vmlinuz-2.6.x-x ro root=LABEL=/ rhgb quite)
5. Add the argument ‘single‘ to the end of the line and then press ENTER.
6. Press the ‘b‘ key to boot.
7. After booting, type ‘passwd‘ to change your root password.
8. The end, reboot your workstation and done.

Of cause, there are many others way to retrieve your root password.
The solution I give here is only one of the solutions.
Hope, my sharing can help you.

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