Hi TOUREAmidouFlorian,
>I'm configuring a network access control (NAC) using a Windows 2008 Active Directory for my clients and a Cisco 2950 switch.
I meet some cases have the same issue with you that "no response to the EAP Response Identity packet" are due to switch issues.
Since I'm not familiar with Cisco products, I found this article for your reference, you may check if the configurations on the switch are correct, for better help, you may consult Cisco supporters:
(This is a third party article, it may change the content without notification, we are not in charge of it):
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_19_ea1/configuration/guide/2950scg/Sw8021x.html
Besides, in order to verify if the NPS server could receive related packets from client, we may use network monitor to capture packets on NPS server.
Network Monitor download link:
https://www.microsoft.com/en-us/download/details.aspx?id=4865
Best Regards,
Anne
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