When you establish a user connection, the user's login policy and the current node determine the logical server context of the connection.
When effective logical server assignment for the user’s login policy is one or more logical servers, then the logical server context of the connection is determined based upon current node’s unambiguous membership in one of the specified logical servers.
A connection fails if the current node is not a member of any of the logical servers assigned to the user’s login policy.
A connection also fails if the effective logical server assignment for the user’s login policy is set to NONE.