we are using wlc 2106 and accesspoints LAP1242 and acs 4.2 with microsft win2003 as a CA.
Integrated acs with ad for user authentication using EAP-TLS (certificates).Installed the server certificate in ACS and selected the same in trust list also.
and installed the client certificate in dell laptop and tried.
Authentication is getting passed in first attempt after that it getting failed for all attempts,and error in acs is showing as "ACS user unknown".
please help me out.