NIS Server hangs creating auto.home

I’ve recently decided to add auto.home to my nis maps. It didn’t exactly appear to be there by default, but it was in the Makefile. I added auto.home to the Makefile as follows:
all: auto.home auto.master group hosts passwd shadow

This worked for the first make, the maps were pushed to my slave servers and everything was happy. However upon any attempt to update the auto.home in /etc, and push out new maps fails. See below, the application hangs when creating the NIS auto.home map. Please help, thanks!

/var/yp# make
gmake[1]: Entering directory /var/yp/mydomain' gmake[1]: ypservers’ is up to date.
gmake[1]: Leaving directory /var/yp/mydomain' gmake[1]: Entering directory /var/yp/mydomain’
Updating auto.home…