What is rc.yp?
 

I notice in /etc/rc.d/ there is a file called rc.yp. What is yp, and do I need it running?

yptools: yptools (NIS servers and clients)

NIS stands for Network Information Service. NIS is usually used to
provide /etc/passwd and /etc/group information throughout the network.
Most Sun-based networks run NIS, and Linux machines can take full
advantage of existing NIS service or provide NIS service themselves.

So I take it I don't need it running on my Slack desktop machine. So chmod -x /etc/rc.d/rc.yp.