Cause

At random times, a slave NIS server has a problem that causes ypbind(1M) to report ypserver not responding, and the machine must be rebooted. The syslog file contains the following:

Dec 14 07:11:03 rahab syslog: yp_all - 
RPC clnt_call (transport level) failure:
RPC: Unable to receive; An event requires attention