Both the parent and the child domain have TDOs that describe this relationship, including the encryption type. The default relationship between a child domain and a parent domain is a two-way transitive trust that supports the RC4 encryption type. The attributes of a TDO describe the trust relationship, including the Kerberos encryption types that the trust supports. In Active Directory, a domain object has associated trusted domain objects (TDOs) that represent each domain that it trusts. The problem occurs because of the configuration of the trust itself. When the DC builds the referral ticket, instead of comparing the encryption types of the client and the service, it compares the encryption types of the client and the trust. However, when a client requests access to a service in a different, trusted domain, the client's DC must "refer" the client to a DC in the service's domain.
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As part of the Kerberos authentication process, the DC checks that both the client and the service can use the same Kerberos encryption type. However, other factors can prevent the client from connecting to similar services in another trusted domain, even if those services also use AES128 or AES256 encryption.Īt a very high level, a domain controller (DC) is responsible for managing access requests within its own domain. Such a client can continue to connect to services within its own domain that use AES128 or AES256 encryption.
#TARGET W2K19 WINDOWS 10#
Security guides such as the Windows 10 Security Technical Implementation Guide provide instructions for improving the security of a computer by configuring it to use only AES128 and/or AES256 encryption (see Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites). RC4 encryption is considered less secure than the newer encryption types, AES128-CTS-HMAC-SHA1-96 and AES256-CTS-HMAC-SHA1-96. You disable the RC4_HMAC-MD5 encryption type, leaving the AES128-CTS-HMAC-SHA1-96 and AES256-CTS-HMAC-SHA1-96 encryption types enabled.This problem occurs when you configure the child domain (or just the client) as follows:
#TARGET W2K19 PASSWORD#
Changing or resetting the password of Administrator will generate a proper key.
The accounts available etypes : 23 -133 -128. While processing an AS request for target service krbtgt, the account Administrator did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 1). Source: Microsoft-Windows-Kerberos-Key-Distribution-Center On the domain controller of the child domain, Event Viewer records the following Event 14 entry: Log Name: System If you run a network trace on communications to and from the client computer, the trace contains the following Kerberos messages: 6 9:35:19 AM 17.8417442 192.168.1.101 192.168.1.2 KerberosV5 KerberosV5:AS Request Cname: Administrator Realm: Sname: krbtgt/ Applies to: Windows Server 2019, Windows Server 2016, Windows Server 2012 R2 Original KB number: 4492348 SymptomsĪ computer in a child domain of an Active Directory Domain Services (AD DS) forest cannot access a service that resides in a different domain within the same forest.
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