NIS auth woes

["Craig" <craigsc@zdata.co.za>]

Hi Guys

I am getting the following error messages in my auth.log and as a result
these
users cannot logon:

extract: (auth.log)
--------

Aug 25 12:36:23 tesla cucipop[3691]: authentication failure williep
10.3.0.113
Aug 25 12:36:24 tesla cucipop[3691]: lost williep 10.3.0.113 2, 0 (0), 0
(0)
Aug 25 12:36:46 tesla PAM_unix[3708]: authentication failure; (uid=0) ->
julieu for cucipop service
Aug 25 12:36:48 tesla cucipop[3708]: authentication failure julieu
10.3.0.101
Aug 25 12:36:49 tesla cucipop[3708]: lost julieu 10.3.0.101 3, 0 (0), 0
(0)
Aug 25 12:36:57 tesla PAM_unix[3713]: authentication failure; (uid=0) ->
henriw for cucipop service
Aug 25 12:37:00 tesla cucipop[3713]: authentication failure henriw
10.3.1.128
Aug 25 12:37:01 tesla cucipop[3713]: lost henriw 10.3.1.128 4, 0 (0), 0
(0)

They are using NIS.

Any ideas would be very much welcomed at the point.

Thanks
Craig