I get the following message:
LDAP Contextless Login: User not found after searching the trees on the following LDAP server(s): xx.xxx.xxx.x

This is a Windows 2003 server with sp2
Novell Client 4.91 sp3
Citrix Presentation Server 4.0

I get this message when I connect from a citrix web pass through authentication. When you hit okay to the message it goes on through like it should without asking for authentication.