O AD suporta apenas LDAP sobre UDP de maneira muito limitada. Não muito mais do que poder consultar métodos de autenticação disponíveis.
Active Directory supports search over UDP only for searches against rootDSE. It encodes the results of an LDAP search performed over UDP in the same manner as it does a search performed over TCP; specifically, as one or more SearchResultEntry messages followed by a SearchResultDone message, as described in [RFC2251]. This means that the search response is not encoded as described in [RFC1798]. Only LDAP search and LDAP abandon operations are supported over UDP by Active Directory.
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root DSE (rootDSE): A nameless entry containing the configuration status of the Lightweight Directory Access Protocol (LDAP) server. Typically, access to at least a portion of the root DSE is available to unauthenticated clients, allowing them to determine the authentication methods supported by the server.