Sign up ×
Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

I am trying to submit a request for an SSL certificate on a Domain Controller in order to enable LDAP SSL, and having no end of problems.

I am following the information provided at;en-us;321051 &

Steps taken so far:

  1. Create Servername.inf with the following information

    ;----------------- request.inf -----------------


    Signature="$Windows NT$


    Subject = "CN=servername.domain.loc" ; replace with the FQDN of the DC KeySpec = 1 KeyLength = 1024 ; Can be 1024, 2048, 4096, 8192, or 16384. ; Larger key sizes are more secure, but have ; a greater impact on performance. Exportable = TRUE MachineKeySet = TRUE SMIME = False PrivateKeyArchive = FALSE UserProtected = FALSE UseExistingKeySet = FALSE ProviderName = "Microsoft RSA SChannel Cryptographic Provider" ProviderType = 12 RequestType = PKCS10 KeyUsage = 0xa0


    OID= ; this is for Server Authentication


  2. Create Certificate request by running: certreq -new Servername.inf Servername.req

  3. Attempt to submit Certificate request to CA by running: certreq -submit -attrib "CertificateTemplate: DomainController" request.req
  4. At which point I get the following error: The DNS name is unavailable and cannot be added to the Subject Alternate Name. 0x8009480f (-2146875377)

Trouble shooting steps I have taken so far 1. Modify the Domain Controller Template to supply Subject Name in Request restart Certificate Service, include SAN in Request, same error. 2. Re-installed Certificate Services / IIS / Restarted machine countless times

Any help resolving the issue would be greatly appreciated.

share|improve this question

2 Answers 2

up vote -1 down vote accepted

Check in the Active Directory for servername.domain.loc's entry. Look at its properties, check its DNS name attribute. If it is empty, add the DNS name.

share|improve this answer
Hi There RainDoctor, I've checked the properties as asked and it does have a DNS name. – Beuy May 28 '10 at 1:02

I found the solution here: You need to edit the template to use the request supplied subject name instead of building it from AD.

Here are the relevant steps that i followed:

  1. Click start->run, then key in command mmc
  2. Click File in the mmc console, then select Add/Remove Snap-in…
  3. Click Add… buton in the Add/Remove Snap dialog
  4. Select Certificate Templates, Click Add
  5. Close the window in step 4) available standalone snap-in window.
  6. You will see “Certificate Templates”, Click OK.
  7. Find “Domain Controller Authentication” in “Console Root\Certificate Templates”
  8. Double click “Domain Controller Authentication” to open it.
  9. Select the “Subject Name” tab, then select “Supply in the request”, click Apply

After editing the template you need to remove and add it to the CA again.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.