When this occurs, certificates can be requested and enrolled in succesfully using the same templates but other enrollment methods. In other words you can sucesfully request a certificate from that template using the certificates MMC snap-in, script, autoenrollment or exported request. The issue only occurs with web enrollment not allowing the Version 3 template from being available to select.
Frequent other causes of not being able to blanket request a certificate may be that the server is not an Enterprise server, or the requestor does not have Read Allow and Request Allow permissions on the template in Active Directory.
Use a different request method for these certificates. Aside from web enrollment, all other request methods work in this scenario.
An alternative, which should not be attempted in production for customers without extensive testing in a test environment, is available which will allow the version 3 templates to appear in the web enrollment default pages. The reason it is not recomended is that the web enrollment pages, again, may not contain the code necessary for the certificate to populate all needed data, and so the result may be a problematic certificate. Please make sure to keep that in mind when considering doing the steps below. This option is to alter the msPKI-Template-Schema-Version from 3 to 2.
In addition, altering the msPKI-Template-Schema-Version attribute results in a reload of the template cache and CSP cache available.
- On your domain controller go to Start, Run, type AdsiEdit.msc and press Enter.
- In AdsiEdit.msc right-click on the ADSIEDIT node in the left-hand pane and select Connect To in the menu that appears.
- In the Connection Settings dialog select Configuration in the Connection Point section and click OK.
- Expand the nodes in the left-hand pane until you have drilled down to your Templates store (CN=Certificate Templates,CN=Public Key Services,CN=Services,CN=Configuration,DC=,DC=).
- Double-click the Version 3 template you would like to have appear in the web enrollment page.
- Scroll down and select the msPKI-Template-Schema-Version attribute.
- Double-click the msPKI-Template-Schema-Version attribute and change the value from 3 to 2 and click OK.
- Click Apply. This updates the template and CSP list. Keep this in mind if you use 3rd-party CSPs in your environment.
- Go to your web enrollment page (if ran from your CA server) and attempt to enroll the certificate using an advanced request.