Cannot enumerate the target exchange organization with "Cannot refresh the directory information" (4255463)

Enumeration of the target Exchange organization fails with:

Cannot refresh the directory information for DC1.Domain.com. See the Emwmigration.log file for details.

Upon examining the EMWMiration.log, the similar errors to the following may be present:

2014-04-30T14:35:52.9781030Z Thread: 0x1      Trace    Execute SQL: ADD_MAILBOX_DBCOPY @OBJECTGUID = '4975d1x4-d4b4-4dda-9221-85ae5452145d', @DN = 'CN=SERVERNAME\0ACNF:4975d1x4-d4b4-4dda-9221-85ae5452145d,CN=ITDEPT,CN=Databases,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=COMPANYNAME,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain,DC=com' Px414   
30/04/2014 16:35:52:978 QMMEXBasis|Quest.MigrationManager.Exchange.Basis.QSqlCommand.ExecuteNonQuery Error: Exception:

System.Data.SqlClient.SqlException: Procedure or function 'ADD_MAILBOX_DBCOPY' expects parameter '@serverdn', which was not supplied.
30/04/2014 16:35:52 aeEMWGUIShared::E2kEnumerator::Enumerate Error: -2146232060 - Procedure or function 'ADD_MAILBOX_DBCOPY' expects parameter '@SERVERDN', which was not supplied.