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When reactivation-mode timed is configured under the radius or tacacs+ server group, and when the connection to 1st server fails, the ASA is not trying the 2nd server in the list.
Multiple Radius or Tacacs+ servers configured in a server group. 'reactivation-mode timed' configured on the server group and uptime of ASA more that 49 days
Change configuration to 'reactivation-mode depletion'
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