NIS Issues on OpenSuSE 11.3

Hi all.
I recently followed the excellent advice from this thread in order to get NIS set up on my home network:
Setting up NIS
Everything went very well except one issue, whenever my users attempt to change their password they receive an error “yppasswd not running on NIS master”.
Now, I’ve checked the server man times and the yppasswd service is running. I’m at a loss for what to check next. Any advice would be welcome.

Thanks in advance.