Before upgrading, you need to make sure that your AD-based applications and systems support using DCs with Windows Server 2012 R2 as OS. If that is the case then you can promote your new DCs, transfer the FSMO roles and demote the old DCs. Please note that it is recommended to have at least two DC/DNS/GC servers per AD domain for High Availability of AD/DNS and for disaster recovery purposes.
If you are interested in enabling LDAP signing then you can refer to that: http://support.microsoft.com/kb/935834
Hi,
In addition to others, please refer to this blog for upgrading AD to windows server 2012:
Regards.
Hi,
Any update about the issue?
Regards.