This situation can occur when NetWare OS versions are upgraded, but the Network Interface Card (NIC) driver on the NetWare server is not the current version. The upgrade from NetWare 4.0.2 to 4.1 involved a number changes to the Appletalk protocol stack and the network interface ODI and supporting NLM's (NetWare Loadable Module), which may require an updated driver.
The network interface card manufacturer should be contacted to obtain the most current driver. You should also verify that the driver supports NetWare 4.1.
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