RPC Unavailable Error When requesting certificates using MMC

Hi Guys,

I've just installed an Enterprise Root CA that is running on Windows Server 2008 R2 as Domain Controller. Have only one forest/domain. Have couple DC's with 2003 SP2.

Both Auto-Enrollment for computers or request computer certificate using MMC are failing with "The RPC Server is Unavailable". Error code is 0x800706ba. It happens on any Windows Version.

User certificates can be issued, though.

I've have already gone through these docs:

http://blogs.technet.com/b/askds/archive/2007/11/06/how-to-troubleshoot-certificate-enrollment-in-the-mmc-certificate-snap-in.aspx

http://www.networksteve.com/forum/topic.php/getting_error:_RPC_Service_is_unavailable_when_request_certifica/?TopicId=25541&Posts=7

http://social.technet.microsoft.com/wiki/contents/articles/1137.aspx#Features

http://support.microsoft.com/default.aspx?scid=kb;EN-US;922706
http://blogs.technet.com/b/instan/archive/2009/12/07/troubleshooting-autoenrollment.aspx

http://www.windowsecurity.com/articles/Microsoft-PKI-Quick-Guide-Part1.html

http://support.microsoft.com/kb/903220

Regarding the first link posted, I did all the tests and server has passed all of them.

You guys are the last resort before I give up and open a case with PSS.

Any idea?

Regards

Rodrigo Garcone
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