Hope this post finds you in good health and spirit.
This post is about krbtgt account and its purpose why this is required and why it is in disabled state.
Every Domain Controller in an Active Directory domain runs a KDC (Kerberos Distribution Center) service which handles all Kerberos ticket requests. AD uses the KRBTGT account in the AD domain for Kerberos tickets. The KRBTGT account is one that has been lurking in your Active Directory environment since it was first stood up. Each Active Directory domain has an associated KRBTGT account that is used to encrypt and sign all Kerberos tickets for the domain. It is a domain account so that all writable Domain Controllers know the account password in order to decrypt Kerberos tickets for validation. Read Only Domain Controllers (RODCs) each have their own individual KRBTGT account used to encrypt/sign Kerberos tickets in their own sites. The RODC has a specific KRBTGT account (krbtgt_######) associated with the RODC through a backlink on the account. This ensures that there is cryptographic isolation between trusted Domain Controllers and untrusted RODCs.
The KRBTGT account is a local default account that acts as a service account for the Key Distribution Center (KDC) service. This account cannot be deleted, and the account name cannot be changed. The KRBTGT account cannot be enabled in Active Directory.
KRBTGT is also the security principal name used by the KDC for a Windows Server domain, as specified by RFC 4120. The KRBTGT account is the entity for the KRBTGT security principal, and it is created automatically when a new domain is created.
Windows Server Kerberos authentication is achieved by the use of a special Kerberos ticket-granting ticket (TGT) enciphered with a symmetric key. This key is derived from the password of the server or service to which access is requested. The TGT password of the KRBTGT account is known only by the Kerberos service. In order to request a session ticket, the TGT must be presented to the KDC. The TGT is issued to the Kerberos client from the KDC.
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