The order of evaluation of firewall rules is documented here: technet.microsoft.com/en-us/library/cc755191%28WS.10%29.aspx. The problem is that blocking rules come before admission rules, so if I create a rule to block everything on the public profile, my admission rules don`t even take into account after that. After creating the authorization rules, I set the default outbound connection policy in the public profile to Block. It works like a charm, except that NLA doesn`t always work. Network Location Recognition (NLA) is a feature offered on Windows Server 2012 R2 and all Windows workstation editions starting with Windows 8.1 and later, including Windows 10. When you connect to a network (LAN or wireless), it is often misidentified as a public network instead of a private network, or vice versa. The same issue also occurs when adding an additional network adapter to a Windows 2012 server. This article describes how to use Windows PowerShell to quickly change network adapter identifiers between a public or private network and ensure that the correct firewall rules are applied (if any). Now, for two trickier rules: first, allow outbound authentication from lsass.exe Starting with Windows Vista, Microsoft has integrated a service into Windows that dynamically adjusts firewall rules and security based on the network connection you`re using.
The service is called Network Location Awareness Service or NLA for short. If you connect your laptop to a domain-connected Office port, you`ll get a domain profile. Now go to a hotel and connect to their Wi-Fi. You will receive a public profile. For more information about NLA and how it affects your connection, see TechNet. This causes problems because a public network profile also results in a public firewall profile. Public firewall profiles are specifically designed to play security and block most traffic, including SQL logins used by your line-of-business application. A host-based firewall that prevents outbound RPC communications from completing negotiations.
Windows Firewall default rules prevent non-local subnet traffic for certain services. It should be noted that incorrect network profiles (private or public) also mean that Windows Firewall is applying the wrong rules to network adapters. For example, a public network may have very strict rules configured, while the private network may have less restrictive rules. As can be understood, this also creates a serious security vulnerability, and therefore, the correct network profiles (private or public) must be applied to each network interface card (network card). So what does NLA want that is not defined in the built-in rules and is blocked by a standard public blocking policy? Apparently, NLA works by default on the public profile (that makes sense), and I need to create an additional authorization rule for NLA to work. I recorded the blocked packets during identification, but there is too much noise. And I really can`t understand why it works sometimes. This forum has been migrated to Microsoft Q&A. See Microsoft Q&A to ask new questions. The second custom rule is to allow WMI requests if they are included in your Group Policy. In the next window, select the Not configured or disabled check box.
Then click Apply, tap OK, and restart your PC. In most cases, the “The remote computer you`re trying to connect to requires an NLA” error can come from your PC (not the remote computer). So, to solve it, you need to configure some settings on your device. So tl;dr – my domain-joined desktop wants RDP to a domain-joined server. What ports must be open to force network-level authentication for the connection? At home, NLA cannot recognize the private profile in about 30% of cases. In my company, the domain profile appears as unauthenticated about 90% of the time with the yellow warning sign. And NLA identification is just very slow 100% of the time. When I change my default policy to allow outbound connections, it`s fast and works. Have you ever been in the office and found that your critical business application can`t connect to your SQL server? Upon further investigation, you may find that your domain is no longer on a “domain network” but on a public network. Disabling and re-enabling NLA settings on your device can help. Let`s see how you can do it: Modisha is a content writer with a master`s degree in astrophysics from the University of Cape Town.
While doing research during his graduate years, he fell in love with content writing and never looked back. He has been writing blogs and how-to guides for over 3 years now. When he`s not listening to music, he`s watching action comedy movies, playing video games, or traveling. Finally, wait for the process to complete and restart your device. Packet fragmentation in your site-to-site tunnel (re:IPsec). For example, the error might be “The remote computer requires network-level authentication that your computer does not support.” Sometimes it says, “The remote computer you`re trying to connect to requires network-level authentication.” The screenshot below shows our Windows 2012 R2 server configured with two network cards. We renamed the NICs to make them easy to identify, as Ethernet0 was renamed “Ethernet0 – WAN Adapter” while Ethernet1 was renamed “Ethernet1 – LAN Adapter”. Finally, run the Incoming Connection troubleshooter. This detects and resolves connection issues with incoming computers. If system settings didn`t fix the problem, PowerShell can help.
Therefore, we will explore how you can disable and re-enable NLA settings using this tool. The most likely cause of this problem is a slow connection, which is most often found on networks that span different regions. You may have 2 desktops and your SQL server may not be in the same location as your domain controller. Or maybe your company has embraced the cloud and you`re in a hybrid configuration with domain controllers in the office and your SQL server in Microsoft Azure. You probably already know that when the Windows NLA detects the type of network you`re on, it tries to connect the gateway, perform an LDAP query, and detect your DNS suffix, among other things. Learn more here: Network Location Knowledge (NLA) and its relationship to Windows Firewall profiles Contact New Signature to find out how we can help your business most effectively harness the power of Windows 10 in conjunction with the cloud to avoid these types of issues in your environment. There is a remote office. We have restricted traffic according to best practices In this environment, the only way to RDP to the remote desktop is to disable NLA.
I`d rather not do this for many reasons, but it was never clear what traffic I needed to open from my desktop to these remote servers. If the problem persists, try reinstalling the network adapters as follows: In the other direction, the only open port from my office is 3389 to these servers Unlike domain authentication, NLA only runs at different times: 1) at startup or 2) when a network connection changes. On a server, your network connection usually doesn`t change (and for good reason), so the NLA sets the network address at startup and doesn`t query again until the next service restart (usually the next restart). If the NLA service is started before the domain authenticates to a domain controller, it is assumed to be on a public network. This allows the service to continue running at startup, but gives the domain a little more time to authenticate before the service looks for the network location. If the answer is yes, we have managed to find the cause of the sudden change in network profiles. Do the same with the predefined rule: File and printer sharing I don`t have a solution, but a few things come to mind that are worth investigating: NLA is not at the port level. You will continue to use 3389 with or without NLA. Then, enable the NLA settings as follows: This issue can be caused by corrupt or incompatible network drivers.
Thus, you can update or reinstall these drivers to resolve this error. No matter how this error appears on your device, you can fix it using the methods described. And if the problem persists, try applying these fixes to the remote device as well. Let`s start troubleshooting internet connections: Finally, follow these steps to re-enable NLA settings: I like what you usually do. This kind of work and smart reporting! Keep up the good work, guys, I`ve added you to our blogroll. Updated 2014-05-13. Note that another outbound rule must be added for NLA and firewall profile switching to work correctly: Here`s how: Start by enabling the predefined rule: Core Networking Then, select Automatically search for updated driver. From there, follow the on-screen instructions to complete the process. www.reddit.com/r/networking/comments/a94jhd/nla_ports/ computers in this office are joined to the same domain.
To facilitate this, the remote headquarters has full access to the domain controllers. Depending on how you`ve configured your network settings, you`ll likely see the “Remote computer requires NLA” error. You can fix the problem by resetting your network settings to factory defaults. However, it is frustrating when you encounter problems while trying to connect to a remote PC. Just when you try to connect, you get an error message that says, “The remote computer requires network level authentication (NLA).” Thanks for the link, this could be a relevant answer.