LDAP_STRONG_AUTH_REQUIRED is an LDAP Result Code
that Indicates one of the following:
- In Bind Requests, the LDAP server accepts only strong authentication.
- In a client request, the client requested an operation such as delete that requires strong authentication.
- In an Unsolicited Notification of disconnection, the LDAP server discovers the security protecting the communication between the client and server has unexpectedly failed or been compromised.
There might be more information for this subject on one of the following: