Previously, autofs would only convert maps of the names "auto_home" and "auto_mnt" to auto.home and auto.mnt. A bug was filed about this, and the behaviour has changed as a result. The original intent was to convert all underscores to dots. Based on the limited information in this bugzilla, it really looks like the customer should have UNDERSCORETODOT set to 0.
I'm still waiting for feedback on this.
My auto.master was as follows before the latest autofs update and clients were getting the maps from NIS fine: /remnet /etc/auto.remote -bg,intr,rw /homenet /etc/auto.homes -bg,intr,rw /proj /etc/auto.project -bg,intr,rw /apps /etc/auto.apps -bg,intr,rw /opt/media /etc/auto.media --timeout=10 -fstype=auto,loop,user,owner After the latest autofs update, the clients started complaining that they could not find the NIS maps and stopped working. I changed my auto.master as follows to get it to work with the latest autofs update: /remnet auto.remote -bg,intr,rw /homenet auto.homes -bg,intr,rw /proj auto.project -bg,intr,rw /apps auto.apps -bg,intr,rw /opt/media auto.media --timeout=10 -fstype=auto,loop,user,owner