We are running into problems with laptops authenticating to our network. We are getting a variety of behavior, none of which is very consistent. We keep getting a "Domain is not available message" when users attempt to log in. We've seen it work for one user and then not the next user.
In all cases, the access point has been up and functioning. We have several carts of 15 laptops. Each cart has a dedicated access point. We have configured each machine to point to point to a specific SSID.
Access points are configured for WPA authentication.
Our access points authenicate to a single Cisco ACS server. We are seeing errors like below in the failed authentication logs on the ACS server.
03/08/2011 11:13:58 Authen failed host/RIV340-67199.asd.aubu
edu Default Group 001a.7353.81bf (Default) External DB user invalid or bad password .. .. 6188
We have also seen errors like below on the actual access points:
Station f0b4.79dd.8427 Authentication failed
Interface Dot11Radio0, Deauthenticating Station 8c7b.9d47.3be8 Reason: Previous authentication no longer valid
Interface Dot11Radio0, Station RIV801AP1 0022.fad0.213c Associated KEY_MGMT[WPA]
I've seen other posts that these errors could be pointing to interference issues. I checked the APs and they all seem to be using a different channel. We have all of the Radios set to use the least congested frequency.
What we've experienced is if we plug the laptop into the network via an ethernet cable, something seems to refresh/update. Upon doing that, any user can log into the laptop using the access point. The laptop you plugged into the network will function using the wireless for a couple weeks, then start having the same issues.
We'll get an entire cart stabilized, it moves to a different room and it starts malfunctioning again. We have configured the APs to live on the same VLAN/ip subnet so we dont' believe it's an issue with DHCP leasing.
Thanks in advance for any assistance!