Kerberos authentication supports various configuration scenarios, depending on the host environments of the client and server. The domain controller host provides storage for the user, service accounts, credentials, the Kerberos ticketing services, and Windows Domain services. A keytab file is required for Kerberos authentication, which lets users authenticate with the KDC without being prompted for a password. The keytab file is created with the ktpass utility.
The ktpass command tool utility is a Windows support tool. The ktadd utility is the equivalent on UNIX. This example uses the following server and account names:. This action makes your Windows server a domain controller. Raising the domain functional level is irreversible. The password is the same as the one used for creating the service account for the web server. The password is same as the one used for creating the service account for Policy Server. Both the stash file and the keytab file are potential point-of-entry for a break-in.
The Kerberos protocol makes no such assumption. Windows Authentication Overview. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? 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 added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: How to back up and restore the registry in Windows. Use the Netdom tool from the Windows Server Support Tools or from the Windows Server Support Tools to reset the domain controller's machine account password:.
Make sure that the netdom command is returned as completed successfully. If it is not, the command did not work. For the domain Contoso, where the affected domain controller is DC1, and a working domain controller is DC2, you run the following netdom command from the console of DC For more information about this issue, click the following article numbers to view the articles in the Microsoft Knowledge Base: You cannot start the Active Directory Users and Computers tool because the server is not operational.
Skip to main content. This browser is no longer supported. Important Setting 0 is not compatible with setting 2. Intermittent failures might occur if both settings are used within a forest. If setting 0 is used, we recommend that you transition setting 0 Disable to setting 1 Deployment for at least a week before moving to setting 2 Enforcement mode. It is likely that the other KDC in the logs does not contain the update or is in Disabled mode.
This prevents the KDC from enforcing security checks on the ticket. This prevented security checks from running and could open security vulnerabilities. The Key Distribution Center KDC encountered a ticket that did not contain information about the account that requested the ticket while processing a request for another ticket.
The KDC encounters a TGT or other evidence ticket, and the account that requested the TGT or evidence ticket does not match the account that the service ticket is built for. The Key Distribution Center KDC encountered a ticket that contained inconsistent information about the account that requested the ticket. This could mean that the account has been renamed since the ticket was issued, which may have been part of an attempted exploit.
Q1 What happens if I have a mixture of Active Directory domain controllers that are updated and not updated? A mixture of domain controllers that are updated and not updated but have the default PacRequestorEnforcement registry key value of 1 are compatible with each other. However, Microsoft strongly advises against having domain controllers that are updated and not updated in an environment.
A mixture of domain controllers that have PacRequestorEnforcement values of 0 and 1 are compatible with each other. A mixture of domain controllers that have PacRequestorEnforcement values of 1 and 2 are compatible with each other. A mixture of domain controllers that have PacRequestorEnforcement values of 0 and 2 are not compatible with each other and might cause intermittent failures.
Please see the Registry key information section for further details. Need more help? Expand your skills.
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