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Event ID 9 — KDC Certificate Availability

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Applies To: Windows Server 2008

The Kerberos ticket exchange is encrypted from the Kerberos client to the Kerberos Key Distribution Center (KDC) by using a domain controller certificate, also known as the KDC certificate.

Event Details

Product: Windows Operating System
ID: 9
Source: Microsoft-Windows-Security-Kerberos
Version: 6.0
Symbolic Name: KERBEVT_BAD_KDC_CERTIFICATE
Message: The client has failed to validate the Domain Controller certificate for %2. The following error was returned from the certificate validation process: %1.

Resolve

Request a new domain controller certificate

The Kerberos client validates the domain controller certificate to ensure that the communication is encrypted.

To resolve this issue:

  • Delete the domain controller certificate that is no longer valid.
  • Request a new certificate.

To perform these procedures, you must be a member of the Domain Admins group, or you must have been delegated the appropriate authority.

Delete the domain controller certificate that is no longer valid

To delete the domain controller certificate that is no longer valid:

  1. On the domain controller, click Start, and then click Run.
  2. Type mmc.exe, and then press ENTER.
  3. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
  4. Click File, and then click Add/Remove Snap-in.
  5. Click Certificates, and then click Add.
  6. Click Computer account, click Next, and then click Finish.
  7. Click OK to open the Certificates snap-in.
  8. Expand Certificates (Local computer), expand Personal, and then click Certificates.
  9. Right-click the old domain controller certificate, and then click Delete.
  10. Click Yes, confirming that you want to delete the certificate.
  11. After the certificate is deleted, follow the procedure in the "Request a new certificate" section.

Request a new certificate

To request a new certificate:

  1. Expand Certificates (Local computer),right-click Personal, and then click Request New Certificate.
  2. Complete the appropriate information in the Certificate Enrollment Wizard for a domain controller certificate.
  3. Close the Certificates snap-in.

Verify

To perform this procedure, you must be a member of the Domain Admins group, or you must have been delegated the appropriate authority.

To verify that the Kerberos Key Distribution Center (KDC) certificate is available and working properly:

  1. Click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
  2. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
  3. At the command prompt, type certutil -dcinfo verify, and then press ENTER.
  4. If you receive a successful verification, the Kerberos KDC certificate is installed and operating correctly.

KDC Certificate Availability

Core Security