The Remote Computer Requires Network Level Authentication.

The "The remote computer requires Network Level Authentication, which your computer does not support." error is what you get when you try to connect to computer running Windows Vista,7 or 2008 with using recently updated Remote Desktop Client.


It looks like Windows XP doesn't support Network Level Authentication even with the new Remote Desktop Client so you will have to turn NLA off in Vista, 7 or 2008.
Got to System Properties and select "Allow connections from computer running any version of Remote Desktop (less secure). It's less secure, but it works.


If the above screen is gray, use the following procedure to modify the registry automaticlly:

1. On windows XP install Service Pack 3 then reboot.
2. Download this file: http://cid-ac9f3fda92291acc.office.live.com/self.aspx/.Public/Tech%20IN/LSASEC.reg
3. Restart your PC and try again to access the server remotly.

OR you can manually modify the registry:

1. Click Start, click Run, type regedit, and then press ENTER.
2. In the navigation pane, locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
3. In the details pane, right-click Security Packages, and then click Modify.
4. In the Value data box, type tspkg. Leave any data that is specific to other SSPs, and then click OK.
5. In the navigation pane, locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders
6. In the details pane, right-click SecurityProviders, and then click Modify.
7. In the Value data box, type credssp.dll. Leave any data that is specific to other SSPs, and then click OK.
8. Exit Registry Editor.
9. Restart the computer.

Install Windows 2008 R2 Step by Step

Installing Windows Server 2008 is pretty straightforward and is very much like installing other Windows, but I thought I'd list the necessary steps here for additional information. For those of you who have never installed OS before, the entire installation process is different than it used to be in previous Microsoft operating systems, and notably much easier to perform.
Follow this procedure to install Windows Server 2008:

Before installing windows we should configure the RAID based on the needs, the recommended is RAID 5 but it depend on the server type.

1. Insert the appropriate Windows Server 2008 installation media into your DVD drive. If you don't have an installation DVD for Windows Server 2008, you can download one for free
2. Reboot the computer.

3. When prompted for an installation language and other regional options, make your selection and press Next.

4. Next, press Install Now to begin the installation process.

5. Product activation is now also identical with that found in Windows Vista. Enter your Product ID in the next window, and if you want to automatically activate Windows the moment the installation finishes, click Next.

If you do not have the Product ID available right now, you can leave the box empty, and click Next. You will need to provide the Product ID later, after the server installation is over. Press No.

6. Because you did not provide the correct ID, the installation process cannot determine what kind of Windows Server 2008 license you own, and therefore you will be prompted to select your correct version in the next screen, assuming you are telling the truth and will provide the correct ID to prove your selection later on.

7. If you did provide the right Product ID, select the Full version of the right Windows version you're prompted, and click Next.

8. Read and accept the license terms by clicking to select the checkbox and pressing Next.

9. In the "Which type of installation do you want?" window, click the only available option – Custom (Advanced).

10. In the "Where do you want to install Windows?", if you're installing the server on a regular IDE hard disk, click to select the first disk, usually Disk 0, and click Next.

If you're installing on a hard disk that's connected to a SCSI controller, click Load Driver and insert the media provided by the controller's manufacturer.
If you must, you can also click Drive Options and manually create a partition on the destination hard disk.

11. The installation now begins, and you can go and have lunch. Copying the setup files from the DVD to the hard drive only takes about one minute. However, extracting and uncompressing the files takes a good deal longer. After 20 minutes, the operating system is installed. The exact time it takes to install server core depends upon your hardware specifications. Faster disks will perform much faster installs… Windows Server 2008 takes up approximately 10 GB of hard drive space.

The installation process will reboot your computer, so, if in step #10 you inserted a floppy disk (either real or virtual), make sure you remove it before going to lunch, as you'll find the server hanged without the ability to boot (you can bypass this by configuring the server to boot from a CD/DVD and then from the hard disk in the booting order on the server's BIOS)
12. Then the server reboots you'll be prompted with the new Windows Server 2008 type of login screen. Press CTRL+ALT+DEL to log in.

13. Click on Other User.



 14. The default Administrator is blank, so just type Administrator and press Enter.

15. You will be prompted to change the user's password. You have no choice but to press Ok


16. In the password changing dialog box, leave the default password blank (duh, read step #15…), and enter a new, complex, at-least-7-characters-long new password twice. A password like "topsecret" is not valid (it's not complex), but one like "T0pSecreT!" sure is. Make sure you remember it.

17. Someone thought it would be cool to nag you once more, so now you'll be prompted to accept the fact that the password had been changed. Press Ok.
18. Finally, the desktop appears and that's it, you're logged on and can begin working. You will be greeted by an assistant for the initial server configuration, and after performing some initial configuration tasks, you will be able to start working.