Network Level Authentication error with Remote Desktop Connection between Windows 7 machines
Hello all I am having an issue with Remote Desktop Connection. I can connect to my Laptop from my Desktop using Remote Desktop Connection but when I try to connect to my Desktop from my Laptop I get an error stating that Network Level Authentication is not supported on the machine I am connecting from, i.e. the Laptop. Both the Laptop and the Desktop are running Windows 7 Ultimate. This used to work fine and I am unable to find what has changed. I have even tried doing a Repair Install of Windows 7 Ultimate on the Laptop but still have the same issue. Does anyone have any ideas, short of reinstalling Windows 7 Ultimate from scratch? Thanks in advance Kevin
March 22nd, 2010 1:38pm

Hi Kevin, Based on my research, I suggest you refer to the following article to troubleshoot the issue. I would suggest you to read through the article in the link below and see if it can fix the issue. Why can’t I connect using Remote Desktop Connection? Meanwhile, please also refer to the following articles to configure the Network Level Authentication you can see if that has something useful Configure the Network Level Authentication Setting for an RD Session Host Server Configure Network Level Authentication for Remote Desktop Services Connections If the error message persists, please capture and upload it Thanks, Novak
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March 24th, 2010 9:41am

Hello Thanks for the reply. I already followed the instructions in the articles you listed as I found them when I used Google to research the error. I have uploaded a snapshot of the error I receive at the address listed below. http://cid-22b6e37ca0e5c56f.skydrive.live.com/self.aspx/Troubleshooting/RDP%20Error.PNG Both machines are using Windows 7 Ultimate and I am able to RD into this machine fine, just not the other way. Thanks in advance Kevin
March 25th, 2010 2:34pm

Based on my research, I suggest you also try the following steps. 1.Open registry editor. 2.Navigate or browse to the following key: HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server 3.Locate the fDenyTSConnections subkey, and change the DWORD value to 0. 4.To enforce the use of RDP 6.0 and NLA, navigate to the following key: HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Terminal Server\WinStations\RDP-Tcp 5.Locate the UserAuthentication subkey, and change the DWORD value to 1. 6.Exit registry editor and restart the computer to make the changes effective. Note: Please backup the registry key before modifying the above keys. Thanks, Novak
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March 26th, 2010 9:49am

Hello Thanks for the reply. I have checked the Registry on both machines and those values are already set as you stated. Thanks in advance Kevin
March 26th, 2010 1:22pm

Hi, Please also try the suggestions from the link below on the problematic machine. Network Level Authentication Please Note: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information. Thanks, Novak
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March 29th, 2010 12:03pm

Hello again Thanks for the reply. I had already come across this way to enable NLA when researching this error and unfortunately the settings already exist. Thanks in advance Kevin
March 29th, 2010 3:00pm

Hello all Does nobody have anymore ideas? Thanks in advance Kevin
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April 8th, 2010 8:20pm

You were given the answers. Sorry, but everything he said, is all I know as well.Network Systems Engineer * Zvetco Biometrics * Windows Server 2008 R2 * Core2 6600 @ 3.30GHz * 16 GIGS RAM * NVIDIA 9400GT * **>>PLEASE VOTE POSTS AS USEFUL TO ASSIST OTHER USERS<
May 17th, 2010 11:37pm

You were given the answers. Not a very helpful comment since none of the answers solved his problem. I have the exact same problem, I have a laptop and desktop, both Windows 7 Ultimate and fully updated, both with NLA enabled. I cannot RDP from desktop to laptop, I get the exact same error about NLA. I followed all the links above. I can connect successfully if I disable the requirement for NLA in the remote desktop settings on the laptop. Perhaps this has to do with some sort of firewall or antivirus interference? (I have Norton Security Suite installed on both computers). Also the wireless network I am on is a work network, and they only allow communication over certain TCP ports, I don't know if that would cause NLA to fail.
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May 13th, 2011 11:36pm

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