Do I need to setup separate User Profile Sync for each child domain?

Our SharePoint 2013 on-premise farm is installed on our company major domain “Domain.com”. We have setup user profile sync for domain.com. Under Domain.com there are several child domains a.com, b.com & c.com. These 3 domains have two-way trust with domain.com. On SharePoint users can locate a.com, b.com & c.com in people picker. However these 3 domain’s user profile are not sync. Their “Display Name”, “Email” and other attributes are not in User Profile database.

My question is, do I need to setup 3 additional UPS connection to these 3 domains? Or I should modify the existing connection (the connection for Domain.com)? Thanks.

Follow up question:
At the sync connection setup page, I have checked all domains as following picture:

If I click open the DOMAIN node > Users, I can see all users. If I click open A node > users. There is no user. Also, after I trigger a full sync, no user profiles from A & B domain are created.

In WFE server’s DOS prompt I ran follow and get error:

C:>nltest.exe /dsgetdc:A Getting DC name failed: Status = 1355 0x54b
ERROR_NO_SUCH_DOMAIN

I have verified with the domain controller admin A & B do have users. What could be the problem? Many thanks.

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1 Answer
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No, you should be using the single sync connection for the entire forest. If you have a secondary forest (or more) create a sync connection per forest.

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I am not familiar with AD concept. How can I verify a.com is same forest with domain.com?
– Mark L
Jan 13 ’15 at 2:27

  

 

Use nltest.exe /dsgetdc:A. It will tell you the domain and what forest it belongs to. Or use the Active Directory Domains and Trusts MMC, which will show you the domains of the current forest, and any trusts in place.
– Trevor Seward
Jan 13 ’15 at 4:04

  

 

I typed the command at the SharePoint WFE. It return: Getting DC name failed: Status = 1355 0x54b ERROR_NO_SUCH_DOMAIN. Is it means the sub domain have configuration problem? (of coz I am typing in the real domain name)
– Mark L
Jan 13 ’15 at 6:03

  

 

Or the name you’re using is simply incorrect. Using Active Directory Domains and Trusts, do you see the domain? Or if you click properties on the domain that SharePoint resides in and go to the Trusts tab, is it listed as a trusted forest?
– Trevor Seward
Jan 13 ’15 at 16:02

  

 

Recently we setup a test subdomain named “Subdomain.com“. It is under “Domain.com” (under same forest and verified with nltest.exe). There is one user subdomain\test01.
– Mark L
Feb 18 ’15 at 2:39