Unable to find Domain Controllers for

I have a stable fully functional version of 9.10-STABLE which I want to upgrade to 9.10.2-U3. I CAN perform the upgrade but AD functionality is lost. An examination of debug.log shows

May 14 14:47:36 ParadigmRAID manage.py: [common.freenasldap:1150] FreeNAS_ActiveDirectory_Base.get_SRV_records: looking up SRV records for _ldap._tcp.dc._msdcs.paradigm.local
May 14 14:48:06 ParadigmRAID manage.py: [common.freenasldap:1162] FreeNAS_ActiveDirectory_Base.get_SRV_records: no SRV records for...

Unable to find Domain Controllers for <domain>