NIS with a single NIS server doesn't seem to work unless the "manycast" checkbox is checked. The behavior is this: "getent passwd" hangs after enabling without manycast. Enabling manycast allows getent to work fine.
I think this is a regression from 11.2, but I'm not 100% sure. I know I've set up NIS on 11.2 for one customer without having to do anything special.
Customer reports that having multiple server addresses set up works also, instead of adding manycast, but I couldn't produce that result.