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ORA-06811:

TLI Driver: could not set the IPX network number at init
Cause: The IPX driver has not been correctly installed, or the network number encoded in the /etc/netware/yellowpages file is invalid.
Action: The network number in the yellowpages file should match the four-byte network number of your Novell file server. If this is configured correctly, reinvoke the Oracle root installation. If problem continues, contact your customer support representative.