The ServerObjectGuid contains a GUID that represents the server that is the domain controller hosting the directory service.

 <xs:element name="ServerObjectGuid" type="ser:guid" />

The ServerObjectGuid element is populated from the server!objectGUID attribute on the parent of the nTDSDSA object specified by the GetADDomainControllerRequest/NtdsSettingsDN (section input parameter element. If the server!objectGUID attribute is not present or cannot be read due to the client lacking access rights to read the attribute, the server populates the ActiveDirectoryDirectoryServer/ServerObjectGuid element with a value of 00000000-0000-0000-0000-000000000000.