Adprep was unable to make an LDAP connection to the Active Directory Domain Controller %1. Status/Consequence Adprep requires ...

Windows 7

Adprep was unable to make an LDAP connection to the Active Directory Domain Controller %1.
[Status/Consequence]
Adprep requires connectivity to the local Active Directory Domain Controllers that are to be prepared.
[User Action] 
Verify connectivity to the Active Directory Domain Controller that holds the infrastructure or schema master role, and then restart Adprep.

Adprep was unable to determine whether Microsoft Windows Services for UNIX (SFU) is installed in this forest or not. Status ... Adprep was unable to extend the schema. Status/Consequence The schema master did not complete a replication cycle after the ... Adprep was unable to extend the schema. Status/Consequence There is a schema conflict with Exchange 2000. The schema is not ... Adprep was unable to initialize global variables. Status/Consequence Usually this means system resources are unavailable. ... Adprep was unable to make an LDAP connection to the Active Directory Domain Controller %1. Status/Consequence Adprep requires ... Adprep was unable to modify some attributes on object %1. User Action Check the log file ADPrep.log in the %2 directory for ... ADPREP was unable to modify the default security descriptor on object %1. Status/Consequence Adprep attempts to merge the ... Adprep was unable to modify the security descriptor on object %1. Status/Consequence ADPREP was unable to merge the existing ... Adprep was unable to retrieve information from the local Active Directory Domain Controller. User Action Verify that the ...