I have been banging my head with this. I am attempting to set up a NAC test environment. I have ACS 4.0 running and configured, a Trend Polict Server running and configured and a 2811 with version 12.4(3a) advanced security. I have an end-station running XP Pro SP 2, CTA 2.0 with 802.1x client.
CTA is not being detected on the end-device. I have tried CTA v1.0.55, CTA 188.8.131.52 and two different workstations. There is no firewall running on the end machine, it is simply XP Pro, SP2 and CTA, nothing else and I stopped the firewall service built into XP.
Attached is my router config in regard to NAC and also a debug output.
From the end of the debug output I get connected via my 'clientless' config. Any input would be appreciated.