Joining a Windows Domain Controller as an Additional DC in a Domain

[Nikolai Mishkov]

Hello.
I successfully creat PDC with Zentyal\Samba4. I SRV2003, Win8, Win7, 
Winxp as clients. Now i want to promote SRV2003 as BDC, after that will 
try to install Exchange 2003. But i fail promote the BDC with message:
          "The operation failed because:

Managing the network session with \\umcsrv.umc.bg failed


Multiple connections to a server or shared resource by the same user, 
using more than one user name, are not allowed. Disconnect all previous 
connections to the server or shared resource and try again."

Anyone experienced this ? I follow the steps from 
http://wiki.samba.org/index.php/Samba_AD_DC_HOWTO#Joining_a_Windows_Domain_Controller_as_an_Additional_DC_in_a_Domain
Best regards.
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