What happens to the user if the ProxySG cannot reach the LDAP server during authentication?

When the ProxySG attempts to authenticate a user through an LDAP server and is unable to reach it, the system will not be able to verify the user's credentials against the directory service. This inability to connect means that the authentication process cannot be completed successfully. As a result, the user cannot be authenticated, which is why this answer is appropriate.

In scenarios where the ProxySG cannot access the LDAP server, it typically does not default to immediate authentication or show a generic error page to the user. The system relies on the LDAP server to provide the necessary information to authenticate users, and without that connection, the security protocols require that access is denied. While some systems may have fallback mechanisms like local authentication, in this case, if the LDAP server is unreachable, the first priority is ensuring that the user is properly authenticated against a recognized directory to maintain security integrity.