Failed Logon Delay Causing Performance Issues

On the other day when I got to the office I was called to check a database that was running slow. They had implemented a new process there and wanted to make sure it was not impacted.

When checked I saw this issue using OEM


User SYS causing a strange wait event Failed Logon Delay

Someone had  created a process running with the user SYS but they did not fully configured and a part of the process was trying to connect with the wrong password.

While they were looking in the configuration files and servers to see from where the issue was coming from, I started my own investigation to speed up the process.

1st I had to enable audit as it was disabled for unsuccessful loging attemps

SQL> audit session whenever not successful;

Audit succeeded.


Than I was able to see from where the failed connection came from, I just needed to look for the return code 1017 as ORA-1017 is invalid username/password; logon denied on sys.aud$

col ntimestamp# for a30 heading "Timestamp"
col userid for a6 heading "Username"
col userhost for a15 heading "Machine"
col spare1 for a10 heading "OS User"
col comment$text for a80 heading "Details"

select ntimestamp#, userid, userhost, spare1, comment$text,returncode from sys.aud$ where returncode=1017 or returncode=28000;


Oldie but goldie =)

Hope it helps,

Elisson Almeida

Failed do start Keycloak server – IP_MULTICAST_IF: address not bound

Failed to start Keycloak – Version 11.0.2 on Centos 7

bad argument for IP_MULTICAST_IF: address not bound to any interface

In an attempt to solve this case, searches always return to add the parameter “ = true”. But for me, it didn’t solve.

The only way that solved my problem was to edit the /etc/sysctl.conf file. disabling IPV6.

Add the following at the bottom of the file:

net.ipv6.conf.all.disable_ipv6 = 1

net.ipv6.conf.default.disable_ipv6 = 1

net.ipv6.conf.lo.disable_ipv6 = 1

Save and close the file.

Reboot the machine.

MySQL won’t start [ERROR] Found option without preceding group in config file

Hey folks,

have you ever received a call for a MySQL on windows that stopped working after someone did something at their my.cnf? Then you try to start the service by cmd and get the following error.

mysqld: [ERROR] Found option without preceding group in config file C:\ProgramData\MySQL\MySQL Server 8.0\my.ini at line 1.
mysqld: [ERROR] Fatal error in defaults handling. Program aborted!

Well, for some reason, the editor that was used (no idea which one was), threw some random byte at the beginning of the file. To solve that (on windows at least), open the file on Notepad++, go to Format > Convert to ANSI. Save the file and start again the service.

What was the weirdest thing that happened to you on a Windows Server?