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Wednesday, July 23, 2014

Windows - Certificate Auto Enrollment Fails

KB ID 0000921 Dtd 01/02/14


I was trying to get Windows 7 to auto enroll with a CA on Windows 2008 R2, after a couple of reboots the certificates were simply not appearing on the test client I was working on.


1. Test to make sure the client can see the CA, and is able to communicate with it, issue the following command;
certutil -pulse
CertUtil -pulse failed
As you can see above, the first time I ran the command I got the following error;
CertUtil: -pulse command FAILED: 0x80070005 (WIN32: 5)
CertUtil: Access is denied.

I then ran the command window 'as administrator' and it completed, this was the first inkling I had, that permissions were probably not right.
2. Run mmc on an affected machine, and add in the certificates (local computer*) snap-in. right click the 'personal container' > attempt to get the certificate you have published manually.
*Or local user if you are auto enrolling user certificates.
Certifcate RPC server is unavailble
At that point I got this error;
Active Directory Enrollment Policy
STATUS: Failed
The RPC server is unavailable.

3. The most common cause for that error, is the membership of the 'Certificate Service DCOM Access' group is incorrect, check yours and make sure it matches the one below.
Certificate Servi DCOM Access Group Membership
4. On the CA Server launch the Certification Authority management tool and look at the properties of the CA Server itself, on the security tab make sure yours looks like this, (Domain computer and domain controllers should have the 'request certificates' rights).
CA Server Security Settings
5. Still on the CA Server, check the permissions on the C:\Windows\System 32\certsrv directory, authenticated users should have Read & Execute rights.
certsrv folder pemissions
6. This is the change that finally fixed mine: In active directory users and computers, locate the Builtin container, within it there is a group called 'Users'. Make sure it contains Authenticated Users and INTERACTIVE.
Builtin users group membership
7. Run a 'gpupdate /force' on your test client, and/or reboot it.

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