We have windows 2008 Active Directory and also it is our Radius server. We have XP as a client.
We use Cisco 4400 Series Controller and Cisco Aironet 1142 Wireless-N Access points .
The Laptops were connecting automatically into the wireless network once they are joined to the domain and adding the laptop to the wireless security group in the AD.
All of sudden all the 20 laptops got disconnected from our wireless network.
The Laptops can detect our wireless network if i refresh the wireless network. On the system tray the pop says:
Windows was unable to log you on to the network MDomain. (MDomain is our SSID)
The wireless network got disconnected on 10 december. In saw the event iD on this particular date in the Radius server .
A certificate in the chain for CA certificate 0 for TullipCA has expired. A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file. 0x800b0101 (-2146762495).
Active Directory Certificate Services TullipCA can not open the certificate store at CN=NTAuthCertificates,CN=Public Key Services,CN=Services in the Active Directory's configuration container.
I logged into the wireless controller and under Monitor I get continious logs under - Most recent traps:
AAA Authentication Failure for UserName:host/LAPTOP1.domain.local User Type: WLAN USER
AAA Authentication Failure for UserName:host/LAPTOP2.domain.local User Type: WLAN USER
AAA Authentication Failure for UserName:host/LAPTOP3.domain.local User Type: WLAN USER
Where do in check if the certificate (TullipCA) is expired or not which is named in the event viewer log. Will the certificate be named as TullipCA ?
Any help much appreciated