LDAP is used to search AD-LDS (ADAM) to retrieve Active Directory object information. During the Online Restoration (agentless and agent-based) and Group Policy Restoration, the LDAP API is used to perform modifications to specified Active Directory objects.
RMAD does not use LDAP for authentication of credentials or for Domain Controller connectivity. RMAD is using LDAP version 3, and the password is not in plain text, but is "encrypted". RMAD uses the Generic Security Services Application Program Interface (GSSAPI) to authenticate user logon. GSSAPI is included in the Kerberos protocol.
RMAD does not use LDAP for transfer, but deploys a Backup Agent to the domain controller. The Backup agent will collect data and make a backup file. If you store the backup file on console side, the backup file will be transfer by encrypted RPC protocol; if you use Remote Storage and assign a UNC path, the backup is copied by SMB protocol. The user can assign a password to encrypt the backup file.
When recovering an Active Directory® forest, Recovery Manager for Active Directory (RMAD) automatically selects a DC in each domain to perform an authoritative (primary) restore of the SYSVOL folder. To select such a DC, RMAD uses a number of predefined criteria listed in this section. These criteria are listed in the order they are applied by RMAD. If no DC meets the first criteria in the list, RMAD tries to apply the next criteria. RMAD keeps going through the list of criteria, from top to bottom, until it finds a suitable DC.
Criteria used to determine if a DC is suitable for an authoritative (primary) restore of the SYSVOL (in the order of priority):
DC has the PDC Emulator role.
DC has the Domain Naming Master role or Schema Master role in the forest.
DC has the RID Master role in the domain.
DC is a DNS server in the domain.
DC resides in the largest Active Directory® site (as compared to other DCs in the domain).
The overall success of a domain or forest recovery operation very much depends on the domain controllers being restored from backups. Not only it is important to ensure these domain controllers are restored from recent and trusted backups, it is also necessary to temporarily isolate these domain controllers to guarantee that no dangerous or unwanted data will be replicated to them from their replication partners and to block requests to Active Directory® from client workstations during the recovery. Recovery Manager for Active Directory isolates domain controllers by creating a service dependency and using custom Internet Protocol security (IPSec) rules.
Before isolating the domain controllers being restored from backups, Recovery Manager for Active Directory backs up the IPSec settings existing in your environment to revert to these settings later.
Then, at the recovery step named Enable domain controller isolation, Recovery Manager for Active Directory does the following:
Establishes a dependency between the IPsec Policy Agent (PolicyAgent) service and the Active Directory Domain Services (NTDS) service. As a result, the Active Directory Domain Services service cannot start until the IPsec Policy Agent service starts.
Activates a number of custom IPSec rules defined in the IsolateDC.bat file.
The IsolateDC.bat file is located in the Recovery Manager for Active Directory installation folder (by default, this is %ProgramFiles%\Quest\Recovery Manager for Active Directory). The IPSec rules defined in the IsolateDC.bat file block all IP traffic between the domain controllers and their replication partners, except for the IP traffic generated by the following tools/services:
Remote Desktop Connection client
Ping command
File sharing services
Domain Naming System
These IPSec rules also apply to the IP traffic from the domain controllers to the Forest Recovery Console computer. Traffic from the Forest Recovery Console computer to the domain controllers is not affected by these IPSec rules.
Note |
You can edit the IsolateDC.bat file to define the IPSec rules that become active during recovery. However, we cannot guarantee that problems that may occur if you incorrectly edit the IsolateDC.bat file can be solved. Edit the IsolateDC.bat file at your own risk. |
At the recovery step named Ensure that domain controller isolation is disabled, Recovery Manager for Active Directory removes the dependency between the Active Directory Domain Services service and the NTDS service and uses the UnisolateDC.bat file to revert to the pre-recovery IPSec settings.
The UnisolateDC.bat file is located in the Recovery Manager for Active Directory installation folder (by default, this is %ProgramFiles%\Quest\Recovery Manager for Active Directory).
When recovering an Active Directory® forest, Recovery Manager for Active Directory adds the global catalog to the DCs that acted as global catalog servers before the recovery, provided that these DCs were successfully restored from backup.
If none of DCs that acted as global catalog servers before the recovery were successfully restored from backup, Recovery Manager for Active Directory adds the global catalog to the DC which was assigned the Schema Master role during the recovery.
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