Transfer or Seize FSMO Roles

It is preferable to transfer FSMO roles over Seizing them, however, if the old FSMO DC is no longer active/bootable, you will need to Seize. If that's the case, never reconnect the old FSMO server after roles have been seized.

Transferring FSMO roles to a new DC

1. Open Admin CMD
2. ntdsutil
3. roles
4. connections
5. connect to server [server name] <- the server you want to transfer the roles to
6. q
7. Transfer infrastructure master
8. Transfer naming master
9. Transfer PDC
10. Transfer RID master
11. Transfer schema master
12. q
13. q
14. exit

Seize FSMO roles to a new DC

1. Open Admin CMD
2. ntdsutil
3. roles
4. connections
5. connect to server [server name] <- the server you want to transfer the roles to
6. q
7. Seize infrastructure master
8. Seize naming master
9. Seize PDC
10. Seize RID master
11. Seize schema master
12. q
13. q
14. exit

For a more detailed article go here:

https://support.microsoft.com/en-au/help/255504/using-ntdsutil-exe-to-transfer-or-seize-fsmo-roles-to-a-domain-control