captive portal issue

[maxmania]

Hello everyone,

I have a issue with supplicant user and CP on the 6450.

At my company, external contractors use there own laptop to work.
When they arrive, they plug the laptop to the switch, they must wait for the fail of the supplicant process , and proceed to the CP logon.
After the successful authentication on the CP, if the laptop is idle for more then 5 min. the user will lose the authentication and will be stuck on the suppliant process!!

802.1x 1/24 direction both port-control auto quiet-period 60 tx-period 30 supp-timeout 30 server-timeout 30 max-req 2 re-authperiod 3600 no reauthentication
802.1x 1/24 trust-radius disable
802.1x 1/24 ap-mode enable
802.1x 1/24 non-supplicant session-timeout disable interval 43200 trust-radius disable
802.1x 1/24 force-l3-learning disable port-bounce enable
802.1x 1/24 captive-portal session-limit 12 retry-count 3
802.1x 1/24 supp-polling retry 2
802.1x 1/24 captive-portal inactivity-logout disable
802.1x 1/24 supplicant policy authentication pass user-network-profile "maint" block fail captive-portal
802.1x 1/24 non-supplicant policy authentication pass group-mobility user-network-profile "maint" block fail captive-portal
802.1x 1/24 captive-portal policy authentication pass user-network-profile "maint" block fail user-network-profile "Authentication-Fail" block

Any ideas??