We help IT Professionals succeed at work.
Get Started

Smart Card Logon failure KDC certificate CERT_TRUST_IS_NOT_VALID_FOR_USAGE

Last Modified: 2015-08-30
We are trying to enable Smart Card Logon.

When we attempt to logon with a Smart Card we get "The Kerberos Protocol encounterd an error while validating the KDC certificate during Smart Card Logon."

In the system log we see the following event:

Event ID 9
The certificate is not valid for the requested usage.
The client has failed to validate the Domain Controller certificate for DC.domain.com. The following error was returned from the certificate validation process: The certificate is not valid for the requested usage.

Looking in the CAPI log we see that the domain controller cert is passing the CRL checks, but is returning:

We are using all 3rd party certificates.
The CA certificates have been added to the correct CA stores via Group Policy.
The root is in the Trusted Root Certificate store.
The 2 intermediate CA's are in the Intermediate CA store.

The CA certificates have all be added to the NTAuth store.

All the domain controllers have certificates, issued by the above CA's.

The smart card certificates are issued by the above CA's.

certutil -urlfetch -dcinfo verify says the KDC certs on all of the domain controllers are valid.

I can't figure out what I'm missing.   Why are the clients not trusting the domain controller certificates for the required usage?
Watch Question
This problem has been solved!
Unlock 1 Answer and 20 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE