All of the servers in a failover group should use the same authentication mechanism and name service. For example, a failover group should not use one server with NIS authentication and other servers with NIS+ authentication.

If a failover group does have different authentication mechanisms, the servers might fail to obtain their existing non-smart card mobile (NSCM) sessions if a username contains the same characters but the case is different, for example, ps121664, PS121664, or Ps121664.