Currently our NIS servers are on Sol 2.6 machines in which NIS uses the shadow.adjunct file (ie C2 security). This makes the shadow information unretreiveable via typical NIS methods since the NIS database files are not generated. RH 6.0 thus fails to authenticate using this method of NIS security. I contacted the author/maintainer of yp-tools (Thorsten Kukuk <kukuk.de>) and per his suggestion, I tried SuSE 6.2 which properly authenticated logins via NIS using the above configuration.
A newer version of ypbind should fix this problem.
This authentication failure is also present in RH 6.1. By default, 'login' uses the PAM module 'pam_pwdb.so'. In order to use C2 enabled NIS, one must edit /etc/pwdb.conf so that the 'nis' entries read 'decnis'. This is documented /usr/doc/pwdb-xxx. /\/elson