Symptom
Affected users are not able to log in via Windows File Sharing and do not have a tim_password value in NetInfo.
Solution
1. Connect to the server via Server Admin.
2. Click the General tab.
3. Choose the NetInfo/root domain from the Users & Groups menu.
4. Reset the users' passwords to create a tim_password value in NetInfo. You may do this either using a batch edit or one at a time.