TNS-01189,TNS-01169

Question

Hi,
i am getting this error on my 10g database , this error occurred twice in between 2 hours, after that their is no errors like this.what is the reason for this can any one help me on this please?
Regards
Venkat
TNS-01189: The listener could not authenticate the user
TNS-01169: The listener has not recognized the password
26-JAN-2013 15:44:47 * version * 0
26-JAN-2013 15:44:47 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=localhost)(USER=oracle))(COMMAND=STATUS)(ARGUMENTS=64)(SERVICE=LISTENER)(VERSION=169870336)) * status * 1189
TNS-01189: The listener could not authenticate the user
TNS-01169: The listener has not recognized the password
26-JAN-2013 15:44:47 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=localhost)(USER=oracle))(COMMAND=log_file)(ARGUMENTS=4)(SERVICE=LISTENER)(VERSION=169870336)(VALUE=listener)) * log_file * 1189
TNS-01189: The listener could not authenticate the user
TNS-01169: The listener has not recognized the password
26-JAN-2013 15:44:47 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=localhost)(USER=oracle))(COMMAND=log_file)(ARGUMENTS=4)(SERVICE=LISTENER)(VERSION=169870336)(VALUE=qqqualys)) * log_file * 1189
TNS-01189: The listener could not authenticate the user
TNS-01169: The listener has not recognized the password
26-JAN-2013 15:44:47 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=localhost)(USER=oracle))(COMMAND=log_file)(ARGUMENTS=4)(SERVICE=LISTENER)(VERSION=169870336)(VALUE=listener)) * log_file * 1189
TNS-01189: The listener could not authenticate the user
TNS-01169: The listener has not recognized the password

Answer 1

[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.