Thanks for your email and new information.
From your screenshot of the setup error message, I find the "This server
has a trust relationship with rpco.local" error message. Please note the
following restriction in Windows SBS 2003:
* Only one computer in a domain can be running Windows Small Business
* Windows Small Business Server 2003 must be the root of the Active
* Windows Small Business Server 2003 cannot trust any other domains.
* A Windows Small Business Server 2003 domain cannot have any child domains.
Based on current information, I suggest you perform a system reinstall on
the additional domain controller in the existing domain, please refer to
the following steps:
How to install Small Business Server 2003 in an existing Active Directory
I hope the above information helps.
Have a nice day.
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