4 Switches model S55T configured as stack. The authentication in the VLAN's of the clients of the network was configured using Dynamic Vlan feature following the instructions of the documentation. There is an auth fail vlan configured. Everything works Ok.
The problem is that sometimes, randomly, some clients (correctly registered in the radius server) can't being authenticated by Dynamic Vlan and they fall in auth-fail-vlan wich is Ok, but later, they are kicked off totally from the network and there is no way to find the mac address of the client in the switch nor unban the client.
The only thing i've try after read the manual was increase the auht-fail max attemps, reauth max, and the timeout seconds of server and suplicant to check if could be an strange connectivity problem with the radius server in a timely moment.
PD: Problems with interface of the network clients or cable was discarted.
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