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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 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.

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.

Posted on Sunday, May 27, 2007 10:13 PM | Filed under: System |

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# re: The remote computer requires Network Level Authentication, which your computer does not support. 9/24/2007 6:10 PM Robert McGrath
Finally a solution that works for remoting an XP machine into Vista. I experienced the same VNC frustration as everyone else. I was successful after I followed your instruction. Good graphic and good job!

# re: The remote computer requires Network Level Authentication, which your computer does not support. 9/25/2007 8:30 AM David
Tnx, Robert. I'm glad my post was useful for you!

# re: The remote computer requires Network Level Authentication, which your computer does not support. 12/2/2007 8:35 PM Falco
Dito for me!

# re: The remote computer requires Network Level Authentication, which your computer does not support. 4/1/2008 5:40 PM Amanda
Perfect. This is exactly what I needed. Thanks.

# re: The remote computer requires Network Level Authentication, which your computer does not support. 4/14/2008 8:12 PM Susan
I ned to change mine, but don't have the option to change (grayed out)

# re: The remote computer requires Network Level Authentication, which your computer does not support. 4/17/2008 5:06 PM kOCHOS
great thaNKsss!!!!

# re: The remote computer requires Network Level Authentication, which your computer does not support. 4/19/2008 7:15 AM tina Laimo
HI there, I am having similar problem RDP into my PC running vista
the second option which is:
"Allow connections from computers running any version of any remote desktop (less secure) is greyed out.

please assist. thankz..Tina

# re: The remote computer requires Network Level Authentication, which your computer does not support. 4/25/2008 1:06 AM David
Apparently XP will have NLA added as part of service pack 3 (End April 08).. Lets just wait and see...

# re: The remote computer requires Network Level Authentication, which your computer does not support. 4/30/2008 2:58 PM Bob
Mine, too, is "grayed out" and i can't seem to locate a group policy anywhere that enforces that setting. Any suggestions would be appreciated. (I AM the network admin)

# re: The remote computer requires Network Level Authentication, which your computer does not support. 5/12/2008 8:42 PM Tim
Please help.

I set this option up in 2008. (NLA)
Now even from a vista machine I cannnot connect to the DC for doing changes.
Please help.
thanks

# re: The remote computer requires Network Level Authentication, which your computer does not support. 7/18/2008 5:10 PM Joe
To enable NLA in XP machines; first install XP SP3, then edit the registry settings on the XP client machine to allow NLA

• Configure Network Level Authentication

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.

Now when you run remote desktop you will notice that Network Level Authentication is supported. To check this, right-click the top left hand corner of a remote desktop session and choose, Help > About

# re: The remote computer requires Network Level Authentication, which your computer does not support. 9/10/2008 5:18 PM Marko
Joe, thanks! Your tip solved the problem :)

# re: The remote computer requires Network Level Authentication, which your computer does not support. 9/18/2008 9:01 PM Steveo
This post worked perfectly.

# re: The remote computer requires Network Level Authentication, which your computer does not support. 11/23/2008 5:21 AM carl
Joe, many thanks.

# re: The remote computer requires Network Level Authentication, which your computer does not support. 11/26/2008 2:32 PM chris
nice one!

thx

# re: The remote computer requires Network Level Authentication, which your computer does not support. 12/17/2008 8:50 AM sanjib barua
I have made the changes in the registry key..but could not able to do network level authentication from XP machine...caould you please guide me ---sanjib barua

# re: The remote computer requires Network Level Authentication, which your computer does not support. 12/24/2008 6:26 PM Oren
LIES!!!!

http://support.microsoft.com/kb/951608/

# re: The remote computer requires Network Level Authentication, which your computer does not support. 6/12/2009 5:19 AM hangta
Joe, Thanks!

# re: The remote computer requires Network Level Authentication, which your computer does not support. 6/18/2009 9:58 PM guy
This was extremely helpful.
Thanks,


# re: The remote computer requires Network Level Authentication, which your computer does not support. 1/5/2010 1:52 PM Flesz
Thanks, that should solve my problem

# re: The remote computer requires Network Level Authentication, which your computer does not support. 5/6/2010 9:52 PM Danny
Thanks for the solution.
I followed the instruction, and it works for me for a while. However, today I got "An authentication error has occurred. The Local Security Authority cannot be contacted Remote computer: xxx.xxx.xxx.xxx

Any idea.

# re: The remote computer requires Network Level Authentication, which your computer does not support. 5/31/2010 6:26 AM RK
Awesome Joe! Thank you!

# ps you need vista ultimate to run rdc 7/15/2010 2:18 PM James
ps you need vista ultimate to run rdc

# re: The remote computer requires Network Level Authentication, which your computer does not support. 8/30/2010 6:56 AM Brent
Is there a way to perform the first item thru the command prompt? I have lost remote desktop connection to my remote web server.

Thanks!!

# re: The remote computer requires Network Level Authentication, which your computer does not support. 12/10/2010 1:52 PM Brahmaprakash Mishra
Thanks!
it worked!

# re: The remote computer requires Network Level Authentication, which your computer does not support. 4/16/2011 2:21 AM Bardagul
Thank you Joe. It worked!

# re: The remote computer requires Network Level Authentication, which your computer does not support. 6/1/2011 4:00 AM Andy
Worked perfect! Awesome. Thanks. :)

# re: The remote computer requires Network Level Authentication, which your computer does not support. 6/22/2011 8:10 AM Duraibabu
Worked Perfect, Thanks a lot

# re: The remote computer requires Network Level Authentication, which your computer does not support. 7/24/2011 12:24 AM Asif
Perfect!!! Thanks

# re: The remote computer requires Network Level Authentication, which your computer does not support. 8/11/2011 7:03 AM Vamshi
Hey Joe,

I really appreciate your post.... It worked..

Thanks

# re: The remote computer requires Network Level Authentication, which your computer does not support. 10/17/2011 2:50 PM sunil kumar
Good one...

# re: The remote computer requires Network Level Authentication, which your computer does not support. 11/29/2011 9:58 AM shailesh
great job..!! good artical..!!

# re: The remote computer requires Network Level Authentication, which your computer does not support. 1/12/2012 12:50 AM Scotty
Thank you Joe!!! You just saved me a mountain of time and stress..

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