oracle 12.2 RAC
15-JAN-2020 22:27:53 * (CONNECT_DATA=(COMMAND=VERSION)) * version * 1189
TNS-01189: The listener could not authenticate the user
1) The workaround for this issue is to set the following listener.ora file parameter: IP=V4_ONLY
(ADDRESS = (PROTOCOL = IPC)(KEY = <KEY>))
(ADDRESS = (PROTOCOL = TCP)(HOST = <hostname>)(PORT = 1521)(IP=V4_ONLY))
Following this change, a LSNRCTL stop and start would be necessary.
This issue is fixed in versions 22.214.171.124 and 12.2. At the time of this writing, there are interim patches available for lower versions where this problem might be present.
2) Add the following lines to the GRID_HOME/network/admin listener.ora for all the nodes in the RAC, stop and start all the listeners