It seems to work fine for me. When I run your example, it produces this output:
Login Server (portal30_sso)
default: cn description objectclass
nooptions: cn description objectclass
PORTAL30_SSO
PORTAL30_SSO
portal30_sso
default: sn cn userpassword objectclass
nooptions: sn cn userpassword objectclass
PORTAL30_SSO_ADMIN
PORTAL30_SSO_ADMIN
portal30_sso_admin
default: sn cn userpassword objectclass
nooptions: sn cn userpassword objectclass
PORTAL30
PORTAL30
portal30
default: sn cn userpassword objectclass
nooptions: sn cn userpassword objectclass
PORTAL30_ADMIN
PORTAL30_ADMIN
portal30_admin
default: sn cn userpassword objectclass
nooptions: sn cn userpassword objectclass
PUBLIC
PUBLIC
public
default: sn cn userpassword objectclass
nooptions: sn cn userpassword objectclass