SSL Certifcate Request s2003 DC CA DNS Name not Avaiable

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 http://support.microsoft.com/default.aspx?scid=kb;en-us;321051 & http://adldap.sourceforge.net/wiki/doku.php?id=ldap_over_ssl

Steps taken so far:

1. Create Servername.inf with the following information

   ;—————– request.inf —————–

   [Version]

   Signature="$Windows NT$

   [NewRequest]

   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

   [EnhancedKeyUsageExtension]

   OID=1.3.6.1.5.5.7.3.1 ; 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.