DSA error: Common AcAdTaskHandler LDAP error 0x20. No Such Object (0000208D: NameErr: DSID-031001 (4352704)

All migration sessions do not complete, there is no timing out, just nothing happens.

Log contains entries like:

09/17/07 16:55:41 (GMT-07:00) Common AcAdTaskHandler LDAP error 0x20. No Such Object (0000208D: NameErr: DSID-031001AD, problem 2001 (NO_OBJECT), data 0, best match of:
09/17/07 16:55:41 (GMT-07:00) Common AcService Error 0x80070002. The system cannot find the file specified.

and later

09/17/07 16:55:41 (GMT-07:00) Configurator SCA: Quering service status (QueryServiceStatus, service: AeDSACtrl_SAI584820).
09/17/07 16:55:41 (GMT-07:00) Configurator SCA: Query service status result: type 'Win32 own process', current state: 'Running', controls accepted: 'stop, pause and continue, shutdown', win32 exit code: '0', service specific exit code: '0', check point: '0', wait hint: '0' (QueryServiceStatus, service: AeDSACtrl_SAI584820).
09/17/07 16:55:41 (GMT-07:00) Configurator SCA: No progress during wait hint. Progress time: '200', current wait hint: '0'.

this is where DSA times out and "hangs".