What is Network Policy Server denied access to a user reason code 16?

Asked by: Aylin Heller  |  Last update: November 1, 2025
Score: 4.7/5 (56 votes)

Reason Code: 16 Reason: Authentication failed due to a user credentials mismatch. Either the user name provided does not map to an existing user account or the password was incorrect.

What is Network Policy Server Reason Code 16?

NPS Event ID 6273, reason code 16: Network Policy Server denied access to a user.

What is a network policy server used for?

NPS performs centralized authentication, authorization, and accounting for wireless, authenticating switch, remote access dial-up and virtual private network (VPN) connections.

How do I restart the network policy server service?

To restart the service, click Start, Administrative Tools, Network Policy Server . The Network Policy Server Microsoft Management Console (MMC) opens. In the NPS console, right-click NPS (Local) , and then click Stop NPS Service . Next, right-click NPS (Local) , and then click Start NPS Service .

How to check if radius server is working?

Test RADIUS server online
  1. RADIUS server IP: Please enter RADIUS server IP address.
  2. Port: Please enter authentication port (e.g. 1812)
  3. Secret: Please enter shared secrtet.

Creating a Network Access Policy

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How do I find the RADIUS server on my network?

In the Security Console, click RADIUS > RADIUS Servers or in the Operations Console, click Deployment Configuration > RADIUS Servers.

How do you check the server is working or not?

How To Check if a Server is Online/Offline (Ping)
  1. On Windows, open Command Prompt. (Mac OS X and Linux users can open Terminal.)
  2. Type the following command, including your server's IP address: ping -t 0.0. 0.0.

How do I reboot my network server?

Restart the Windows Server with the GUI
  1. Click the Start menu.
  2. Select the Power button.
  3. Click Restart.

How do I reset my network access?

Select Start > Settings > Network & internet > Advanced network settings > Network reset.

How do I disable network policy server?

To unregister an NPS

Click the Members tab, and then select the NPS that you want to unregister. Click Remove, click Yes, and then click OK.

How to open a Network Policy Server?

In Server Manager, click Tools, and then click Network Policy Server. The NPS console opens.

What port does RADIUS use?

RADIUS uses UDP as the transport protocol. It uses UDP port 1812 for authentication and UDP port 1813 for accounting. RADIUS was originally designed for dial-in user access.

What is the purpose of a network policy?

Network policy is a collection of rules that govern the behaviors of network devices. Just as a federal or central government may lay down policies for state or districts to follow to achieve national objectives, network administrators define policies for network devices to follow to achieve business objectives.

What does reason code 16 mean?

Denial code 16 means that the claim or service is missing necessary information or contains errors related to submission or billing.

What is error code 16?

To protect your PC, your antivirus software and firewall would block some apps and websites from accessing your computer or connecting to the network. This might be the reason why you encounter the error code 16: This request was blocked by the security rule.

How do I fix event ID 16?

Resolution. To resolve this behavior, make sure that the WPAD server's DNS entry is correctly configured, and make sure that your computer's connection-specific DNS suffix matches the DNS domain where the WPAD server's DNS entry is registered.

Will I lose anything if I reset network settings?

This is because network reset will erase all your network-related information and preferences, such as saved Wi-Fi networks, passwords, VPN profiles, and custom firewall rules. Additionally, you should make sure to have the latest drivers for your network devices ready to install after the reset.

Why did my Wi-Fi suddenly stop working?

There could be several factors that affect your internet connection. First, and most likely, is issues with your equipment. Restarting your modem/router will often resolve the issue. Other reasons why your internet may keep going out include inadequate speeds, network congestion and inclement weather.

How do I check my network settings?

Select the Start button, then type settings. Select Settings > Network & internet. The status of your network connection will appear at the top. Windows 10 lets you quickly check your network connection status.

How do you restart the network policy server service?

Restart the NPS service by highlighting NPS and right click > Stop NPS Service, then right click > Start NPS Service.

Should you reboot a server?

We recommend rebooting every six months or so. Dedicated Hosting Servers are simply computers, and just as you would not leave your computer on for months without a single reboot, the same rules apply to servers.

How do I reconnect to a network server?

Automatically Reconnect to a Server on a PC
  1. Open File Explorer and select This PC.
  2. Select the Computer tab, then select Map Network Drive.
  3. Enter the IP address of the server or share name to give the path of the shared drive, then check the box next to Reconnect at sign-in.
  4. Wait for the drive to be mapped.

How do I check my network connection to a server?

How to run a ping network test
  1. Type “cmd” to bring up the Command Prompt.
  2. Open the Command Prompt.
  3. Type “ping” in the black box and hit the space bar.
  4. Type the IP address you'd like to ping (e.g., 192. XXX. X.X).
  5. Review the ping results displayed.

How do I fix my server problem?

Step-by-Step Guide to Troubleshooting Server Errors
  1. Identify Exact Server Error. ...
  2. Check If the Website Down For Everyone. ...
  3. Retry Page Refresh & Clear Cache. ...
  4. Check Security Settings, Connections & Access. ...
  5. Contact Server Administrators. ...
  6. Use Alternate Failing Resources. ...
  7. Resolving Common Server Errors.

How do I know if my server is bad?

Here's what to look out for:
  1. 1) Temperature troubles: CPU running hot. Like a human being, a server might be in trouble when it starts running a fever. ...
  2. 2) Constant reboots or random failures. ...
  3. 3) Computer hanging up and services failing.