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After Windows 7 fails 802.1X on wired network

Hi, I'm testing flex-auth and fail-open which is critical vlan.

when I FAIL(not timeout) to 802.1X authenticate, it is not getting IP address even though the switch initiates MAB.

What I want to do is provisioning 802.1X from ISE and using it.

so flow is like this :

1. the supplicat (windows7) connects to the network.

2. Switch and supplicant tried 802.1X but the 802.1X is not set up on windows 7 so it goes to MAB and I am able to open the ise guest portal.

3. login with ad credential, and install wired 802.1x.

4. reconnect to swith and try 802.1x authentication but I put wrong ID/PW

5. after few times of miss entering ID/PW, I could not get IP from DHCP.

6. verified on SW see if MAB is initiated, and yes. but could not get IP address on windows 7.

does anyone know why ?