Hi Stephan,
you can find some discussion about UCS and FreeNAS here on the forum too.
I have FreeNAS 11.0 running and it is working with:
I found it useful in my case to
- add Freenas to UCS as a new member-server so that you can enable freenas-shares also from UCS. Else (with no prior UCS record) the join will show FreeNAS as Windows-Workstation.
- import the UCS-CAcert to freenas, enter the kerberos setting (perhaps you even don’t have to)
- join with tls and sasl = sign
Best, Bernd