Resolution
Domain Migration Administrator 6.x
fact
Domain Migration Administrator 7.x
symptom
E20741: SID History cannot be updated for LocalGroupA because the SID for LocalGroupA already exists in the forest. rc=8539.
symptom
You will see this error in the migration.log after a group migration when you use 'Map and Merge' for groups and add SID History for the source group when this SID History has already been applied to a group in the target Active Directory.
Example:
Migrate Group A and Group B and their SID Histories from the source to the target. Everything works fine. Then merge A and B together and form Group C in the target. The members merge, but the migration.logs contain the errors and SID History is NOT updated.
cause
A source SID can only be added to one Active Directory object's SID History attribute in a single Forest.
fix
For merging groups:
If you have already migrated Group A and Group B:
- Delete groups A and B from target.
- Create Group C.
- Merge A and B from target to C with SID History.
If you have not yet migrated any groups:
- Create Group C.
- Merge A and B from target to C with SID History.
SIDHistory migrates and works correctly.