A few notes with respect to troubleshooting Active Directory installation problems:
- There must be sufficient disk space to install Active Directory as outlined above. If you receive an error message stating there is not enough space, you will need to delete files to create space, or create an additional volume. Be sure that there is also an NTFS partition available, and use the convert.exe command on an existing FAT partition if necessary.
- When creating a new domain, you will need to ensure that the DNS and Netbios names of the domain are unique. If they are not, the creation cannot proceed.
- You must have the correct privileges to install a domain controller. To create a new forest, you will only need to be a local administrator. By default, to add a child domain to an existing forest (or any new domain), you must be a member of Enterprise Admins. To create a new domain controller in an existing domain, you must be a member of Domain Admins.
- If you get a domain not found error when adding a domain controller to an existing domain, be sure that at least one domain controller is available and that it has properly registered its SRV records in DNS.
- In order to remove the last domain controller in a domain, you must be a member of the Domain Admins group for that domain. The last domain controller in the root domain cannot be removed if child domains still exist.