Can't re-issue domain controller certificate to Windows 2008 Server

Our Domain is controlled by a Windows 2003 SBS Server with two 2008 (X64) Global Catalogue servers as backups.  I am trying to re-issue a domain controller certifcate to one of the and it fails with the following error message:

Failed: The RPC server is unavailable. The certificate request could not be submitted to the certification authority.

The RPC service is running on both the Server 2008 and SBS 2003 Domain Controller and the CA is running (it's on the SBS 2003), so why can't I re-issue?  I don't have ISA server running and I have disabled the firewall on both servers to eliminate that....
LVL 3
-Juddy-Asked:
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-Juddy-Connect With a Mentor Author Commented:
FIXED!!

Sorted it myself, it was down to NTFS permissions on the SYSVOL:

The problem was Share and NTFS permissions were not set properly for the SYSVOL Share:

Permissions for C:\

NTFS Permissions
Administrators = full control
Creator owner = none checked, but special permissions checked and greyed out
Everyone = none checked, but special permissions checked and greyed out
System = Full Control
Domain\Users = Read & Execute, List Folder contents, Read

Permissions for C:\Windows\Sysvol

Share
Do not share this folder

NTFS
Administrators = full control
Authenticated Users = Read & Execute, List Folder Contents, Read
Creator Owner = none checked, but special permissions checked and greyed out
Server Operators = Read & Execute, List Folder contents, Read
System = Full Control

Permissions for C:\Windows\Sysvol\Sysvol

Share
Share this folder
Maximum Allowed
Administrators = full control
Authenticated Users = Full Control
Everyone = Read

NTFS
Administrators = Full Control, greyed out (inherited)
Authenticated Users = Read & Execute, List Folder contents, Read
Creator Owner = none checked, but special permissions checked and greyed out
Server Operators = Read & Execute, List Folder contents, Read, (greyed out)
System = Full Control, greyed out (inherited)


 
After I have set the proper file permissions I ran the following from command prompt
secedit /configure /cfg %windir%\repair\secsetup.inf /db secsetup.sdb /verbose

<enter>

Gpupdate

<enter>

Thanks anyway Bawer!
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BawerCommented:
its not matter of RPC, but the event says, make sure the DNS is working fine and the servers can communicate correctly with each other. If you have windows 2008 as backup why don't you transfer the roles to 2008 server and instead make 2003 as backup.
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-Juddy-Author Commented:
I am planning to retire the SBS 2003 as it no longer runs Exchange, SQL or Sharepoint so it's just aking as a DC.  I'll have to look into the transfer of roles and get it sorted; but as for the matter at hand, what would you suggest as an appropriate comms test between the servers?
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-Juddy-Author Commented:
Fixed.
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