Goto secondary domain controller and execute ntdsutil in dos.
ntdsutil
ntdsutil: roles
fsmo maintenance: connections
server connections: connect to server XXX.domain.com (secondary DC)
server connections: quit
fsmo maintenance: ?
fsmo maintenance: seize RID master
(Yes on popup window)
fsmo maintenance: Seize infrastructure master
(Yes on popup window)
fsmo maintenance: Seize naming master
(Yes on popup window)
fsmo maintenance: Seize PDC
(Yes on popup window)
Check if all the roles are correctly assigned to new server.
netdom query fsmo
Complete the seizing process by removing the dead server.
ntdsutil
ntdsutil: metadata cleanup
metadata cleanup: connections
server connections: connect to server xxx.domain.com
server connections: quit
metadata cleanup: select operation target
select operation target: list domain
select operation target: select domain 0
select operation target: list sites
select operation target: select site 0
select operation target: list servers in site
select operation target: select server X (dead server)
select operation target: quit
metadata cleanup: remove selected server
(Yes on pop-up window)
Launch
Active Directory Sites and Services > Sites > Default > Servers > delete the dead server
If the dead server hardware is revived, remove Active Directory
Cmd > dcpromo /forceremoval
Yes on pop-up windows and reboot the server for workgroup 🙂