在子域自身出错无法降级的情况下，用ntdsutil手动删
1 删除子域域控
ntdsutil：me cl
metadata cleanup: con
server connections: con to do xx.com
server connections: q
metadata cleanup: se op tar
select operation target: li si
select operation target: se si 0
select operation target: li do
select operation target: se do 1
select operation target: li se in si
select operation target: se se 1
select operation target: q
metadata cleanup: re se se2 删除子域
ntdsutil: me cl
metadata cleanup: con
server connections: con to se xx.xx.com（是server，不是domain）
server connections: q
metadata cleanup: se op tar
select operation target: li si
select operation target: se si 0
select operation target: li do
select operation target: se do 1
select operation target: li se in si
select operation target: se se 0
select operation target: q
metadata cleanup: re se do
3 如果删除子域出错，还可以用partition management 删子域
ntdsutil: Partition management
partition management: con
server connections: co to se xx.xx.com
server connections: q
partition management: li
partition management: delete nc DC=DomainDnsZones,DC=xx,DC=com
partition management: delete nc DC=xx,DC=com (这两行删除的顺序不能反）
4 去林根域控的DNS里手动删掉无效条目。
5 上文凡是0，代表列表中林根域或其域控，1代表子域或其域控。操作时必须仔细核对实际对应序号。
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