Ошибки такие:
dfsdiag /testdfsintegrity /dfsroot:... Warning: The following DFS path is inaccessible and will not be tested again. DFSDiag /TestDFSConfig /DFSRoot:... Error: Element not found. Error: Could not contact the following namespace root:... DFSDiag /TestSites /DFSPath:... Warning: Unable to access the DFS metadata for the following namespace:... New-DfsnRootTarget -Path "..." -TargetPath "..." New-DfsnRootTarget : Operation cannot be carried out because an object already exists. Remove-DfsnRootTarget -Targetpath "..." Remove-DfsnRootTarget : A general error occurred that is not covered by a more specific error code. DFS Namespace Cannot Be Queried
Решение состоит в том, чтобы удалить глючный неймспейс из AD. Для этого:
repadmin /syncall
для ускорения процесса.
https://techjourney.net/dfs-namespace-cannot-be-queried-error-remove-delete-orphaned-namespace/
https://support.microsoft.com/ru-ru/help/977511/