Windows 11 cannot authentication with 802.1x radius authentication server.

Question

Dear All!

I'm having a problem with the RADIUS server; only one of my computers can connect to it. When we attempted to connect to the server, the brand "Dell Running Win-11". The message "can't connect to this network" always appears. I've tried everything I could find on the internet, but it appears that this problem is still unsolvable.

User:

Security ID: NULL SID

Account Name: radius1

Account Domain: -

Fully Qualified Account Name: -

Client Machine:

Security ID: NULL SID

Account Name: -

Fully Qualified Account Name: -

Called Station Identifier: 192.168.15.241

Calling Station Identifier: -

NAS:

NAS IPv4 Address: 192.168.15.241

NAS IPv6 Address: -

NAS Identifier: Fortinet

NAS Port-Type: Ethernet

NAS Port: -

RADIUS Client:

Client Friendly Name: Fortinet

Client IP Address: 192.168.15.241

Authentication Details:

Connection Request Policy Name: -

Network Policy Name: -

Authentication Provider: -

Authentication Server: Lab-radius.apps-gjc.com.br

Authentication Type: -

EAP Type: -

Account Session Identifier: -

Logging Results: Accounting information was written to the local log file.

Reason Code: 48

Reason: The RADIUS request did not match any configured connection request policy (CRP).

Thank you!
Best Reguard.

Answer 1

Hello there,

Based on the error message, we can find that the connection request did not match a configured connection request policy, so the connection request was denied by Network Policy Server.

To troubleshoot this issue, please perform the following steps.

1. On the server running NPS, click Start, click Run, type nps.msc, and press ENTER.
2. In the NPS console tree, open Policies\Connection Request Policies. Review the configuration and processing order of the connection request policy used to match NAP client access requests.
3. In the NPS console tree, open Policies\Network Policies. Review the configuration and processing order of the network policy used to match NAP client access requests.
4. If no errors are found in the connection request policy or network policy configuration, check the status of the NAP Agent on the client's computer and confirm the enforcement client is enabled.

Advanced troubleshooting 802.1X authentication https://learn.microsoft.com/en-us/troubleshoot/windows-client/networking/802-1x-authentication-issues-troubleshooting

Similar discussion here https://techcommunity.microsoft.com/t5/windows-server-for-it-pro/windows-11-clients-cannot-authenticate-to-nps-server-using/m-p/2827382

Hope this resolves your Query !!

--If the reply is helpful, please Upvote and Accept it as an answer–