Listener failed to start with insufficient privilege

Recently we faced an issue where the listener wasn’t able to start and was failing with permission issues : [oracle@Infra001 admin]$ lsnrctl start LISTENERinfra1 LSNRCTL for Linux: Version 12.1.0.2.0 – Production on 23-FEB-2019 07:34:26 Copyright (c) 1991, 2014,...