The meaning of Group depends on the type of module that is doing the authentication. For UNIX and SYSTEM, it means whether the user is a member of the group as defined by the group file (usually /etc/group/). <AuthBy SYSTEM> supports both numeric and symbolic group names.

For <AuthBy SQL>, it runs and uses the result of the GroupMembershipQuery if defined. For more information, see Section 3.41.19. GroupMembershipQuery.

For <AuthBy LDAP2>, it requires GroupSearchFilter and related options to be defined. For more information, see Section 3.47.15. GroupSearchFilter.

For other AuthBy modules, it has no meaning, and always causes a rejection.

Group = wheel