I have a Cisco Aironet 350 Series Access Point and several machines running Windows XP with HP WL500 wireless adapters.
The wireless connection on every machine drops out about 2 or 3 times per day - sometimes for as long as 30 mins. They do reconnect / repair their connections themselves after that time.
The access point log shows the following entries each time and for each machine:
Deauthentication (MAC Address) reason "Previous authentication no longer valid".
and
Station (MAC Address) Failed Authentication. Status Unsupported Authentication Algorithm.
I have recently changed the WEP keys and it worked fine for a while. I cannot understand what has changed to make it start doing this.
I understand that the "Enable IEEE 802.1x authentication for this network" should not be enabled but in any case, I am not using Windows to configure the settings. Instead, I am using the Atheros client utility and I have yet to find an equivalent setting since I am not on site to review it.
Any help or suggestions would be very much appreciated. Thank you in advance.