Trying to get MacOS 10.5 to work with Nw65sp7

When I use a Mac OS 10.4.9 client and log into a Netware 6.5 sp7 box. I do not have any problems logging into our server. However. when I use a Mac OS 10.5 client. It apparently cannot log in. I have learned because I have cleartext turned on. The OS 10.4.0 will work and the 10.5 will not because by default 10.5 disables cleartext logins.

Can anyone help me find some documentation explaining what I have to do to get Netware more secure and give Mac OS 10.5 the ability to login without turning on cleartext logins.