Hello ,
I would like to add Windows 2016 server STD to domain exiting Windows 2003 R2 32bit i got error
Verification of replica failed. The forest functional level is Windows 2000. To install a windows server 2012 R2 Domain or domain controller the forest functional level must be Windows Server 2003 or higher.
however all setting are OK.

the error is in french because i have french Operating Systeme
the time is similary between two server
DNS setting are OK because nslookup work fine
can you help me please to solv this issue ?