do_ypcall: clnt_call: RPC: Unable to receive; errno = Connection refused

Getting errors like:

do_ypcall: clnt_call: RPC: Unable to receive; errno = Connection refused

alos causes any public key ssh setup with no password authenticaton to fail

Resolution:
check if ypbind is running (/etc/init.d/ypbind status) and restart it (/etc/init.d/ypbind start)

Cause:
Check if it is set to run when the box reboots?
Also if it loses connection to the nis master, it may not reconnect.