NAC Problem with Samsung Galaxy Tab

I have campus running cisco clean access. My problem is this. When my wireless tablet w/ android connects to the network and tries to access the internet it takes me to the login page. Now I can put normal guest information in and then gain access to the interent for 5 secs, then no more access. When I check the summary logs on the CAS it shows my device being added to the certified list as well as mac address list. I then check device management and confirm that my device is there under the guest role.
I am not using any NAC agent.
If I want to reconnect I have to remove the device from device management and then i can restart the process with the same results as above. If I add an exemption to allow this device, then it can access the entire network/internet.
My questions are these. Am I missing something obvious? Are android devices not supported? Where would I go to further trouble shoot this?
Thanks for any help.

Are you running inband or out of band. I am thinking you are running inband since you mentioned the filter but i just wanted to make sure. Also what version of clean access are you currently running.
You mentioned that you are able to access the internet for 5 seconds, what does that mean and how did you verify this?
thanks,
Tarik

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NAC Problem with Samsung Galaxy Tab

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