Symptoms
AD sync session fails with the error:
Message
User 'ASP.NET Machine Account' failed with error: 'Default domain for login names not specified.', 170
Cause
Incorrect configuration of Service User
settings under CCP > Directory Synchronization > Service > Service Configuration > Service User. The value Default domain for login names
is not specified (see the screenshot below):
Resolution
Specify the correct domain name in Default domain for login names
field and repeat the synchronization attempt.