It seems like I have a remnant of a previous configuration that causes this part to fail. Server dc.sub.example.com is not know by DNS of /etc/hosts. If you're sure the name is correct, then add it to /etc/hosts. The name isn't correct. I've grepped through some samba, kerberos, sssd, etc. conf files and can't find it. The actual server name is 'cdc'. I subbed the sub.example part of the fqdn for this post.
Thanks,
Steve