TLS/SSL Error?

I just recently enabled a WPA SSID on our wireless network. PEAP with MSCHAP V2 is the EAP method. As far as I know it's working correctly (from all my test clients anyway), but I have seen a number of these messages logged (FreeRadius 2.1.3) and I don't know where they're coming from. My Free radius server has a Thawte Certificate installed. I'm not sure what the message means? Mar 18 15:01:01 rad01 radiusd[8452]: TLS Alert read:fatal:unknown CA Mar 18 15:01:01 rad01 radiusd[8452]: TLS_accept:failed in SSLv3 read client certificate A Mar 18 15:01:01 rad01 radiusd[8452]: rlm_eap: SSL error error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca -Mike