My school has switched to a Novell network, running Novell 5.1 on a Dell
poweredge 2650 server, with about 25 Mac clients and 11 PC clients.

The PCs are happy, but the Mac users are having seemingly intermittent
problems logging into their novell connection to the server. The
passwords will work fine for a while, and then, for no apparent reason,
users get the message "invalid password." Once this happens, the only way
I can get around it is to actually change their password on Network
administrator. They then are able to get back on the server. The Macs are
running OS9.2.2. It happens more often to Mac users on group machines
(using the multiple users login to gain access to the machine).

I can't seem to figure this out, and any help would be deeply appreciated.