Vista - Get username/group membership from another forest?

I need to create a script that querys group membership of a user from
a remote forest that I have a 2-way trust with. This is what I have so
far and it's not working:


Set ADSysInfo = CreateObject("ADSystemInfo")

username=inputbox("Username") 'In the format of
username@xxxxxx

Set RemoteUser = GetObject("LDAP://dc.domain.local/cn=%username
%,ou=is,dc=domain,dc=local")


strRemoteGroups = RemoteUser.memberOf
If IsEmpty(strRemoteGroups) Then
strRemoteGroups = ""
End If
If TypeName(strRemoteGroups) = "String" Then
strRemoteGroups = LCase(strRemoteGroups)
End If
If TypeName(strRemoteGroups) = "Variant()" Then
strRemoteGroups = LCase(Join(strRemoteGroups))
End If

Wscript.Echo strRemoteGroups

I get an error stating "A referral was returned from the server"
8007202B

This means there is something wrong with the LDAP syntax but I can't
seem to figure it out. Any ideas?