The NIS logins are hanging. Our NIS server is RHEL AS3. Please suggest.

[unix syzadmin]

Hi,

The NIS logins are hanging.  Our NIS server is RHEL AS3.

Find below the excerpt of /var/log/messages from our NIS server.

Feb 22 14:46:08 bangapps ypserv[879]: refused connect from
172.22.40.215:832to procedure ypproc_match (bangnis1,
hosts.byaddr;-4)
Feb 22 14:46:18 bangapps login(pam_unix)[28760]: session opened for user
sprakash by (uid=0)
Feb 22 14:46:18 bangapps automount[959]: attempting to mount entry
/home/sprakash
Feb 22 14:46:18 bangapps  -- sprakash[28760]: LOGIN ON pts/10 BY sprakash
FROM bngddia7
Feb 22 14:46:34 bangapps ypserv[879]: refused connect from
172.22.40.215:834to procedure ypproc_match (bangnis1,
hosts.byaddr;-4)
Feb 22 14:46:43 bangapps login(pam_unix)[28760]: session closed for user
sprakash
Feb 22 14:46:48 bangapps ypserv[879]: refused connect from
172.22.40.215:827to procedure ypproc_match (bangnis1,
hosts.byname;-4)
Feb 22 14:46:59 bangapps ypserv[879]: refused connect from
172.22.40.215:868to procedure ypproc_match (bangnis1,
hosts.byname;-4)
Feb 22 14:47:19 bangapps rpc.mountd: authenticated mount request from
bangpcrh5:869 for /export/home/brudramu/P4 (/export/home)
Feb 22 14:47:19 bangapps rpc.mountd: can't stat exported dir
/export/home/brudramu/P4: No such file or directory
Feb 22 14:47:52 bangapps automount[28837]: expired /home/sprakash

How do I go about resolving this.  Please suggest.
Thanks & Regards,
-GnanaShekar-