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ORA-06817:

TLI Driver: could not read the Novell network address
Cause: The file $ORACLE_HOME/spx/address could not be opened for reading and writing.
Action: Make sure ORACLE_HOME is set, and the permissions on the ORACLE_HOME are read, write. If this file has been unintentially deleted, run spxctl (net option) to reset the configured Novell network number for SQL*Net SPX.