User Profile Sync Replicate Access Denied 8453

I've a change to sync 7 Domains with approx 30k users account. follow user profile sync for SharePoint on technet http://technet.microsoft.com/en-us/library/ee721049.aspx

but there's a domain it's domain name doesn't match with user account domain. So, I've to enable NETBIOSDomainNamesEnabled to true

But it still doesn't work. it still error with replicate access denied. Finally, I've found another solution for this challenge. 1.uncheck all directory partition in Configure Directory Partition in AD Connection. only one left.

2.Check Configure Run Profile, does it has only one step. if not, remove all other step.

Then run full sync again and it works. Hope this post helps saving you time.