NIS Binding fails: can't yp_bind: reason: RPC failure

Upon setting NIS client options i see the error can't yp_bind: reason: RPC failure. NIS domain is set correctly, other devices on same VLAN bind ok. Can ping NIS master fine. Freenas can ping itself, including with FQDN. Nothing seems to be intercepted by firewall. When NIS client is enabled, i also see dbus take a very long time to start on boot. Thanks in advance.