Find answers to frequently asked questions about the changes to Lightweight Directory Access Protocol (LDAP).

LDAPS uses its own distinct network port to connect clients and servers. The default port for LDAP is port 389, but LDAPS uses port 636 and establishes SSL/TLS upon connecting with a client. Channel binding tokens help make LDAP authentication over SSL/TLS more secure against man-in-the-middle attacks. March 10, 2020 updates

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Summary CVE-2017-8563 introduces a registry setting that administrators can use to help make LDAP authentication over SSL/TLS more secure. More Information Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For ...

Symptoms Consider the following scenario: The Lightweight Directory Access Protocol (LDAP) directory service is hosted on many nodes that are put behind a Network Load Balancing (NLB) server. The nodes use Secure Socket Layer (SSL), and the nodes are configured to use an alias name. You try to establish SSL connections to the nodes by using the alias name from the LDAP client computer that is ...

Summary CVE-2022-34691, CVE-2022-26931 and CVE-2022-26923 address an elevation of privilege vulnerability that can occur when the Kerberos Key Distribution Center (KDC) is servicing a certificate-based authentication request. Before the May 10, 2022, security update, certificate-based authentication would not account for a dollar sign ($) at the end of a machine name. This allowed related ...

LDAPS verwendet einen eigenen Netzwerkport, um Clients und Server zu verbinden. Der Standardport für LDAP ist Port 389, aber LDAPS verwendet Port 636 und richtet SSL/TLS beim Herstellen einer Verbindung mit einem Client ein.

LDAPS utilise son propre port réseau distinct pour connecter les clients et les serveurs. Le port par défaut pour LDAP est le port 389, mais LDAPS utilise le port 636 et établit SSL/TLS lors de la connexion à un client.

ドメイン コントローラーまたは AD LDS インスタンスに KB5021989 を使用せずに CVE-2017-8563 をインストールすると、すべての LDAPS 接続が LDAP エラー 81 - LDAP_SERVER_DOWNで失敗します。 詳細については、 KB4520412 を参照してください。