- Network cards are set to "autodetect." Manually set them to be whatever the switch or hub is. Usually, you will see other problems besides the authentication issue -- like slow transmissions, e-mail synchronization problems, etc.
- TCP/IP and IPX are both installed on the machine. This generally appears to be related to the binding order and the priority of the protocols. Usually, uninstalling the IPX protocol or unbinding the Microsoft Client from the IPX protocol resolves the problem.
- Win9x machines use WINS to resolve the names and service names to IP addresses. Check to see that the Win2k DCs are using the same WINS as the Win9x clients. Also, check the health of the WINS database. Note that finding the server name in the WINS database is not enough, there should be <1c> and <1b> records in the WINS database for the AD services.
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