problem of vastool user checklogin

Hi experts!

I am newbie for VAS.

After installation of  VAS 3.5 on both server(windows server 2003) and client(redhat5.2) according to the manual,

I failed to login the linux client using a Unix enabled domain user :test

I try to run some troubleshooting commands, and get some information as below:

[root@redhat-head ~]# /opt/quest/bin/vastool user checklogin test
WARNING: NSS lookup (getpwnam) for user test failed, this will almost
certainly mean that you will be unable to log in with a username of test.
This should be fixed before worrying about any other failures.
##I checked /etc/nsswith.conf, and found everything is ok.

[root@redhat-head ~]# /opt/quest/bin/vastool nss getpwnam test
ERROR: Could not look up user for name: test, error = 2.

[root@redhat-head ~]# /opt/quest/bin/vastool info domain
test.com

[root@redhat-head ~]#/opt/quest/bin/vastool -u host/ attrs test uidnumber gidnumber unixhomedirectory loginshell userprincipalname DistinguishedName
ginshell userprincipalname DistinguishedName
distinguishedName: CN=test,OU=Unix,DC=pera-test,DC=com
userPrincipalName: test@test.com
uidNumber: 1000
gidNumber: 1000
unixHomeDirectory: /home/test
loginShell: /bin/bash

I can't  find where the problem is.

Any advise?

Thank in advance!