Hi Previous post Nov 2020. sudo samba-tool domain level show Domain and forest function level for domain 'DC=internal,DC=domain,DC=tld' Forest function level: (Windows) 2008 R2 Domain function level: (Windows) 2008 R2 Lowest function level of a DC: (Windows) 2008 R2 sudo samba-tool domain level raise All changes applied successfully! sudo samba-tool domain level show Domain and forest function level for domain 'DC=internal,DC=domain,DC=tld' Forest function level: (Windows) 2008 R2 Domain function level: (Windows) 2008 R2 Lowest function level of a DC: (Windows) 2008 R2 sudo samba-tool domain level raise --domain-level=2012_R2 ERROR: Domain function level can't be higher than the lowest function level of a DC! sudo samba-tool domain level raise --forest-level=2012_R2 ERROR: Forest function level can't be higher than the domain function level(s). Please raise it/them first! AND the post reply... We still don't support being a 2012R2 DC, we need to upgrade Heimdal, implement FAST and then add claims support before we could offer that. Now on 4.17.4 Can we upgrade now? Still getting the same error.