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Registry Key to Allow Session Keys to Be Sent in Kerberos Ticket-Granting-Ticket

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IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry

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Summary

To provide better security, Microsoft has restricted an interface to retrieve ticket-granting-ticket/session key pairs from the Kerberos security package. Because some third-party programs may require this functionality to operate properly, the following information has been provided so you can re-enable this interface.

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More Information

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

Previous to the change that is described in the "Summary" section of this article, programs could use the Win32 LsaCallAuthenticationPackage API specifying KERB_RETRIEVE_TICKET_REQUEST and either KerbRetrieveEncodedTicketMessage or KerbRetrieveTicketMessage message types to retrieve a Kerberos ticket-granting-ticket (TGT) and the associated session key.

The registry value to include a session key in the TGT:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters

Value Name: allowtgtsessionkey
Value Type: REG_SZ
Value Range: 0 or 1 (default of 0)  

  • 0: The KerbRetrieveEncodedTicketMessage response will not include a session key that allows this TGT to be used for logon.
  • 1: Indicates that a session key should be returned with the TGT according to current behavior.

Note With Windows 10 and Credential Guard, this approach is permanently disabled.

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Article Info
Article ID : 308339
Revision : 12
Created on : 4/20/2018
Published on : 4/20/2018
Exists online : False
Views : 1381