TNS-01189: The listener could not authenticate the user
Answer Posted / guest
Action: Make sure that administrative commands are issued
using the LSNRCTL tool that is of a version equal or greater
than the version of the listener, and that the tool and the
listener are running on the same node. You can issue the
VERSION command to find out the version of the listener. If
a malicious user is suspected, use the information provided
in the listener log file to determine the source and nature
of the requests. Enable listener tracing for more
information. If the error persists, contact Oracle Support
Services.
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