pam authentication not working.

[balu phani]

hi,
i installed svn,trac and i want to access through browse with pam
authentication so i installed pam modules added to httpd.conf

LoadModule auth_pam_module   /usr/lib/httpd/modules/mod_auth_pam.so
LoadModule auth_sys_group_module /usr/lib/httpd/modules/
mod_auth_sys_group.so


and in /etc/pam.d/httpd i added

# auth
auth            required        pam_nologin.so          no_warn
auth            sufficient      pam_radius.so           no_warn
try_first_pass
auth            required        pam_unix.so             no_warn
try_first_pass
# account
#account         required        pam_login_access.so
account         required        pam_unix.so
# session
#session         required        pam_permit.so
# password
#password        required        pam_unix.so             no_warn
try_first_pass

i tried to locate pam_login_access.so but i coun't find so i commented
to test. iam very new to this (may be commenting is foolish thing)

and trac.conf is
<Location /svn/trac/first_pro>
    SetHandler mod_python
    PythonHandler trac.web.modpython_frontend
    PythonOption TracEnv /svn/trac/first_pro
    PythonOption TracUriRoot /svn/trac/first_pro
    AuthType Basic
    AuthName "trac browser"
    AuthPAM_Enabled on
    AllowOverride None
    Require group svnaccess
    Require valid-user
</Location>

so when i try to browse it asking username and password after that is
is giving 401 authorization required.

in /http/log/error.log
i found
[Sun Jul 19 18:22:00 2009] [error] [client 192.168.2.42] PAM: user
'balu'  - invalid account: Permission denied

but i was given full permissions for trac and svn folder.
like
drwxrwxrwx 10 root svnaccess   4096 Jul 19 17:05 first_pro
(for testing) even it is not working and balu is member of svnaccess
group.

so iam not able to locate problem may be
#account         required        pam_login_access.so
commenting this is giving problem if so how to get pam_login_access.so
this one.

please help me.