Wireless Authentication/NPS Cert issue

Hello, I have searched online for several hours and not yet been able to resolve this one. I have an Aruba wireless Controller that uses EAP authentication so my 120 client machines connect automatically to the wifi (as long as their PC is in the proper Active Directory group). On the NPS server in Certificates mmc i noticed the certificate expired yesterday. the past several years i have requested the new cert, pointed the Network Policies under Network Policy Server to the new cert, and the wifi functions fine. This year it will not work. I have confirmed NPS is pointed to the new cert but no avail. Error i get on the client machine in event viewer after attempting to connect is 36881 - "The certificate received from the remote server has either expired or is not yet valid. The SSL connection request has failed. The attached data contains the server certificate." Any ideas on what i should be looking at?
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Craig BeckCommented:
Look at the validity dates on the new NPS cert.  Also, delete the expired cert from the NPS server.

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Pig_TroughAuthor Commented:
i deleted the old cert and it worked. I do not know if it was the deletion of the old cert that did it, or if the system just needed time for changes to apply, but we are set now. This is especially odd because i confirmed that the NPS server policies were pointing to the new certs that expired next year. Thanks though!
Giovanni di MarzioFreelance Cisco WiFi ExpertCommented:
I can enable the "auto-enroll" features to avoid this issue in the future
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