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I am unable to add my new 2016 server to my domain. Says the functional level is 2000 on 2016 but on actual server both domain and forest levels are 2003.screenshots

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    Perhaps you could re-title and reword your question to make it more accurate and relevant. What you're actually doing is trying to add a Windows Server 2016 Domain Controller, not just simply joining the server to the domain. – joeqwerty May 10 '17 at 20:51
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I believe that you must have all domain controllers running 2008 or greater in order to add a 2016 server to a domain with a functional level of 2003.2003 has been deprecated. You should upgrade all servers and raise the functional level to 2008 at minimum.

https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/windows-server-2016-functional-levels

  • George, Thanks for responding. The 2016 server joined the domain without a hitch. I am trying to add active directory role. Upgrading to 2008 is not possible with current business systems. – bob May 10 '17 at 19:58
  • It will not allow it to become a domain controller unless all other domain controllers on the network are at least server 2008. This is because the replication technology used in 2003 is not supported under 2016. – George May 10 '17 at 20:06

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