extLDAPAuthServer is a DisplayString reporting the reachability of external LDAP authentication servers, distinguishing a warning (at least one server reachable, one not) from an alert (all servers unreachable). This graduated warning-versus-alert distinction lets an admin tell whether LDAP authentication redundancy has partially degraded or has failed completely, which changes the urgency of the response. For example, seeing the warning-level message tells the admin one of several redundant LDAP servers needs attention on a non-emergency basis, whereas the alert-level message means all VPN authentication via LDAP has stopped working and needs immediate escalation.