configuring iplanet directory server on Solaris 8

I am trying to install an iplanet Directory server which is to implement LDAP on a solaris 8 system ( Ultra SPARC 60)

the problem is that in one of the last phases of installation after having installed several modules of the server, it tries to log into these modules.

it tries to access
ldap://my_host_name.my_domain_name:port_specified

and gives the error:

ERROR: Ldap authentication failed for url ldap://my_host_name.my_domain_name:port_specified user id admin (151:Unknown error.)

Fatal Slapd Did not add Directory Server information to Configuration Server.

ERROR. Failure installing iPlanet Directory Server. Do you want to continue [n]?

The explanation for the possibility of this error provided on the official iplanet website :
http://docs.sun.com/source/816-5610-10/trouble.htm#11284

is that the DNS has not been configured correctly, or that NIS is being used.

when i installed my OS i did not install any name service along with it and then i sat and configured DNS. I am able to access the internet, though "nslookup" on my hostname or myhostname.domainname fails

i have configured the files:
/etc/resolv.conf (to specify nameservers and domains)
/etc/nsswitch.conf (to enale DNS)
/etc/hosts
/etc/defaultrouter
/etc/defaultdomain

--resolv.conf
Domain hostname
nameserver x.x.x.x
nameserver x.x.x.y
search domainname

i would appreciate all the help i can get in cracking this one
thanx
--quequeg