Chances are you may have arrived here after a vulnerability scan returns a finding called “Terminal Services Doesn’t Use Network Level Authentication (NLA)”. -----OK Help -----The problems might be related to the following problems: 1.) This is quite easy when your host computer is connected to the remote computer via Local Area Network. If the user who joined the PC to Azure AD is the only one who is going to connect remotely, no additional configuration is needed. Solution #3: Disable Network Level Authentication using Registry Editor. A good number of users have indicated that the problem was resolved after the reconnection option had been reconfigured. Disabling it will solve the problem, and here’s how: For assistance, contact your system administrator or technical support" I can connect to the servers using a local admin account and I can uncheck the tickbox "Allow connections from computers running Remote Desktop … If it works, you have succeeded. Open properties of your problematic application collection, go to the Security tab, and uncheck the option “Allow connections only from computers running Remote Desktop with Network Level Authentication”. iv. Disable network authentication. I’m Ravi Theja Madisetty. Network Level Authentication (NLA) is a feature of Remote Desktop Services (RDP Server) or Remote Desktop Connection (RDP Client) that requires the connecting user to authenticate themselves before a session is established with the server. After unchecking this option, all connections are now working again. Network Level Authentication can be blocked via Registry Editor as well. (chicken-egg problem) Final understanding, … The last security recommendation we have is to change the default port that Remote Desktop listens on. For whatever reason it is requesting a reboot, so I let it reboot before I start my work. I started my professional career as an IT Infrastructure Engineer in 2012. Network Level Authentication supported. One workaround is to add file-level exclusions in Bitdefender for both the 64-bit and 32-bit versions of the Windows RDP client: C:\Windows\system32\mstsc.exe; C:\Windows\syswow64\mstsc.exe From Windows 10, uncheck the option to “Allow connections only from computers running Remote Desktop with Network Level Authentication (recommended)”: From Windows 7, it’s setting the option to the Less Secure option rather than More Secure: Alternative Solutions iii. "The remote computer that you are trying to connect to requires Network Level Authentication (NLA), but your Windows domain controller cannot be contacted to perform NLA. So I logged into a server that was setup by another administrator using RDP to configure some software. Solution 3] Disable NLA using Registry. If the connection still doesn't work in Royal TSX, a common cause is that "Network Level Authentication" (NLA) needs to be either enabled or disabled, depending on how your Windows host is set up. Right-Click on RDP-Tcp and select properties. Sometimes the problem can be caused by you or the target system is configured to allow only remote connections that run Remote Desktop with NLA. 3. Furthermore, from this same Windows 7 client computer, I am successfully able to RDP to several other Windows 2008 R2 SP1 servers configured with Network Level Authentication. 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