SharePoint 2010 – USer Profile NetBIOS domain name.

How to enable NetBIOS Domain Names for the User Profile Service in SharePoint 2010.

Run the following powershell
$UPA = Get-SPServiceApplication | ? {$_.TypeName -like "User Profile Service Application"}
$UPA.NetBIOSDomainNamesEnabled=1
$UPA.Update()

Then recreate the AD Connection.