mod_auth_pam giving "invalid account: Dlopen failure"

[S G]

I have a Sparc solaris 9 server with apache 2.0.49 and mod_auth_pam-
2.0-1.1.1 installed. The NIS service is working fine and I'm able to login
on telnet using the NIS server. But when I try to authenticate in httpd
using mod_auth_pam I get the following error in
/usr/local/apache2/logs/error_log

--------
[Sun Apr 02 15:20:02 2006] [error] [client 12.3.4] PAM: user 'jabba' -
invalid account: Dlopen failure
--------

My httpd.conf has the following directives:
--------
LoadModule auth_pam_module modules/mod_auth_pam.so
LoadModule auth_sys_group_module modules/mod_auth_sys_group.so

<Directory "/usr/local/apache2/htdocs/nis/">

AuthPAM_Enabled on
AuthType Basic
AuthName "YP login"
Require valid-user

</Directory>
--------

My /etc/pam.conf has the following directives:
--------
httpd auth required pam_unix.so.1 debug
httpd account required pam_unix.so.1
--------

I have struggled with this for 3 hours now. What am I missing?

THANKS IN ADVANCE.
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