Stuck item in job queue

Red ball a top of panel window. One transaction stuck. I can see it in datalog history, it is a password change for mailbox. This is multiserver system, e-mail server is separate. So I think the mailbox password change should go to the e-mail server host.
I followed instructions in https://www.faqforge.com/linux/debugging-ispconfig-3-server-actions-in-case-of-a-failure/. Loglevel change increased red ball to 3 but it went back to 1 after a while.
On panel server host, running server.sh seems OK:

Code:

# /usr/local/ispconfig/server/server.sh
09.02.2024-21:10 - DEBUG [plugins.inc:155] - Calling function 'check_phpini_changes' from plugin 'webserver_plugin' raised by action 'server_plugins_loaded'.
09.02.2024-21:10 - DEBUG [system.inc:2430] - safe_exec cmd: grep ^opcache.validate_root '/etc/php/7.3/apache2/php.ini' - return code: 0
09.02.2024-21:10 - DEBUG [system.inc:2430] - safe_exec cmd: grep ^opcache.validate_root '/etc/php/7.3/fpm/php.ini' - return code: 0
09.02.2024-21:10 - DEBUG [system.inc:2430] - safe_exec cmd: grep ^opcache.validate_root '/etc/php/7.3/cgi/php.ini' - return code: 0
09.02.2024-21:10 - DEBUG [server:217] - Remove Lock: /usr/local/ispconfig/server/temp/.ispconfig_lock
finished server.php.

I run server sh on the e-mail server:

Code:

# /usr/local/ispconfig/server/server.sh
09.02.2024-20:45 - WARNING - There is already a lockfile set, but no process running with this pid (30071). Continuing.
Database connection failed Database connection failed Database connection failed Database connection failed ^C

I pressed Control-C to exit that stuck process.
What database is it trying to connect to? I did verify connection to dbispconfig on localhost and 127.0.0.1 works with info from interface/lib/config.inc.php. I verified same on web server host running ISPConfig panel.
Update: now red balls shows 3, seems the server loglevel changes are also stuck in queue. Maybe for the e-mail server?
Please help fo figure out what is wrong and how to fix it.

 

Found it.
Fail2ban on e-mail server triggered sasl jail, and banned master hosts IP.
I unban it and start figuring out what is trying to connect and fails.