ypserv Crashes

When the ypserv process crashes almost immediately, and does not stay up even with repeated activations, the debug process is virtually identical to that described in ypbind Crashes. Check for the existence of the rpcbind daemon as follows.

ypserver% ps -e | grep rpcbind

Reboot the server if you do not find the daemon. Otherwise, if the daemon is running, type the following and look for similar output.

% rpcinfo -p ypserver

% program 	vers 	proto 	port 	service
100000	4	tcp	111	portmapper
100000	3	tcp	111	portmapper
100068	2	udp	32813	cmsd
...
100007	1	tcp	34900	ypbind
100004	2	udp	731	ypserv
100004	1	udp	731	ypserv
100004	1	tcp	732	ypserv
100004	2	tcp	32772	ypserv

Your machine might have different port numbers. The four entries representing the ypserv process are the following.

100004 	2 	udp 	731 	ypserv
100004 	1 	udp 	731 	ypserv
100004 	1 	tcp 	732 	ypserv
100004 	2 	tcp 	32772 	ypserv

If there are no entries, and ypserv is unable to register its services with rpcbind, reboot the machine. If there are entries, de-register the service from rpcbind before restarting ypserv. To de-register the service from rpcbind, on the server type the following.

# rpcinfo -d number 1
# rpcinfo -d number 2

where number is the ID number reported by rpcinfo (100004, in the example above).