[oracle@localhost ~]$ oerr tns 1189 01189, 00000, "The listener could not authenticate the user" // *Cause: The user attempted to issue a privileged administrative command, but // could not be successfully authenticated by the listener using the local OS // authentication mechanism. This may occur due to one of the following // reasons: // 1. The user is running a version of LSNRCTL that is lower than the version // of the listener. // 2. The user is attempting to administer the listener from a remote node. // 3. The listener could not obtain the system resources needed to perform the // authentication. // 4. The local network connection between the listener and LSNRCTL was // terminated unexpectedly during authentication message exchange, such as // if LSNRCTL program was suddenly aborted. // 5. The communication between the listener and LSNRCTL is being intercepted // by a malicious user. // 6. The software that the user is running is not following the authentication // protocol, indicating a malicious user. // *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.