NAC – Windows Setup & FAQ

The Network Access Control (NAC) service will help keep the UNC Network more secure and safe by better protecting our customers from electronic threats (viruses, spyware, etc.). For more information on this service, please visit:

Microsoft Windows NAC Installation Guide

1. Open a web browser. When you try to access a website, you will be prompted to click a link to connect. Click the link.


2. Click the Step 1: Download & Install button to download the client to your computer.

3. Save the file in a location where it will be easily accessible, such as your Desktop.  Note that the File Name must not be changed.  If you save the file more than once, your computer may add a (1), (2), etc. for each additional copy.  If that happens, please delete all copies of NAC and then download a new copy.


4. After the file finishes downloading, launch the program to install the client. Note: You can also find the file in the folder where you saved it and double-click it there.


5. Approve the opening of the executable file by clicking OK and Run, when prompted.



6. If your firewall attempts to block the program, be sure to select the Unblock button. Here’s an example of the Windows Firewall prompt.

Warning: If you choose the wrong option the NAC client will not work properly. See the FAQ below for information on how to fix this.


7. After the client is successfully installed, a purple square icon with a white “E” should appear in your Taskbar. If you see green arrows overlapping the “E”, then the client is still installing, so be patient. If there are no green arrows overlapping the “E” the client is successfully installed and you can continue.


8. After the client is installed, return to your web browser and click Step 2: Validate the Agent.

9. You should see a screen similar to the one below while your request is being processed.

10. The scan should take no more than 2-3 minutes. Please be patient!

11. When the scan is complete, a page will briefly appear, letting you know that you’ve been granted network access. This page appears very briefly, so if you’re browsing in another window and you miss it, you will be redirected to the UNC homepage. If you return to find the UNC homepage, the process was a success. Note: if your computer scan fails for a new reason (e.g. No firewall installed or No anti-virus software), then you may get new instructions to follow to remedy those issues. Simply follow the instructions.


Why is the NAC Agent black instead of red?

If the NAC agent shows up in your taskbar as black, it may be because you’re not connected to the UNC Network or your computer is blocking access to the NAC server. If however, you are receiving the NAC website at this time, then the agent may have lost its server settings. Try right-clicking on the “E” icon and choose the “Specify Server” option and enter the following IP:

Why am I prompted to install the software every time I connect to the Internet?

There are 3 potential scenarios that would cause this problem.

Firewall: If the agent software is blocked by a software firewall, then it can’t communicate with our server. Therefore, our server thinks that you haven’t installed the software. You can resolve this by modifying your firewall settings.

Slow PC: It’s possible that your computer is slow enough that the software hasn’t launched and scanned by the time you connect to the network. The solution is to simply wait a minute or two and then refresh the website and it should start to work. If this works, you may want to check your computer for spyware or other software that may be slowing down the boot process. The ITS Help Desk can assist you with this.

Router: If your computer is connected to UNC Network through a personal router, then the router must be whitelisted from NAC. Contact a ResNET RCC for support with this. You might try connecting your computer directly to the UNC Network as an interim solution.

Will I have to install this software again?

As long as the software stays installed and running on your computer, you won’t need to install it again, unless a new version of the software is released. We will do our best to minimize the roll out of new versions. If a new version is available, you will be prompted to update the software.

What happens if I use my computer off-campus?

This service will only work if and when you are on-campus and in an area that requires it. Otherwise, the agent will not be active. If the agent does not communicate with our server for a long period of time, it may give you the option to uninstall. This feature is helpful if you’ve graduated. Of course, you can manually uninstall it at any time.

How do I uninstall this software?

To uninstall the software, go to the Control Panel and click on “Uninstall a Program” (Vista and Windows 7) or “Add/Remove Programs” (XP). Remove the “Enterasys NAC Assessment Agent.”

I have a Mac or Linux, so what do I do?

The software should be smart enough to identify your Operating System. Apple Mac machines will go through a similar process as mentioned above for Windows. See our Apple NAC document for more details.

Linux users should be identified and automatically marked as exempt with this system. If you use Linux and are still seeing the NAC page, submit a request to ResNET and we can have your computer whitelisted from this service.

I don’t live in a residence hall, why am I seeing this site?

See the link at the top of this page for information on how and where this service is being deployed. If you’re near a building where NAC is enabled and you connect to their Wi-Fi, you will be required to use this service.

Why does the NAC Agent continue to scan forever?

Most likely, during the installation you did not allow the agent permission to communicate through your local Windows firewall. You can manually fix this by going to Start > Control Panel > Windows Firewall. You’ll need to edit your settings to allow the NAC Assessment Agent access. Note: The directions may vary depending on your operating system. If you need specific help, simply go to Start > Help and search for “firewall”.