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NAC Server blocking connections after some time

Hi All,

We have a multi-branch 4.9.0 Cisco NAC environment. Nac servers are HA and working in IB virtual gateway mode. All the servers are on trust network. On one of the branches after some time we faced with NAC server blocking all new connections including DHCP requests until adding filter for all the subnet. During that period NAC servers seem to work normally with all perfigo  access logs and HA setup. Also we tried kicking online users to see if they are connecting again and see that they are not appearing in the online user list.

What may be the problem and what is your suggestion?

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