Just had exactly the same problem. Service status shows:
iredadmin.service - iRedAdmin daemon service
Loaded: loaded (/lib/systemd/system/iredadmin.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2020-08-24 02:28:56 UTC; 14min ago
Main PID: 21041 (uwsgi)
Tasks: 6 (limit: 4498)
Memory: 3.5M
CGroup: /system.slice/iredadmin.service
ââ21041 /usr/bin/uwsgi --ini /opt/www/iredadmin/rc_scripts/uwsgi/debian.ini --pidfile /v>
ââ21043 /usr/bin/uwsgi --ini /opt/www/iredadmin/rc_scripts/uwsgi/debian.ini --pidfile /v>
ââ21044 /usr/bin/uwsgi --ini /opt/www/iredadmin/rc_scripts/uwsgi/debian.ini --pidfile /v>
ââ21045 /usr/bin/uwsgi --ini /opt/www/iredadmin/rc_scripts/uwsgi/debian.ini --pidfile /v>
ââ21046 /usr/bin/uwsgi --ini /opt/www/iredadmin/rc_scripts/uwsgi/debian.ini --pidfile /v>
ââ21047 /usr/bin/uwsgi --ini /opt/www/iredadmin/rc_scripts/uwsgi/debian.ini --pidfile /v>
Aug 24 02:28:56 mxserver iredadmin[21041]: spawned uWSGI worker 5 (pid: 21047, cores: 1)
Aug 24 02:29:45 mxserver iredadmin[21041]: -- unavailable modifier requested: 0 --
Aug 24 02:29:53 mxserver iredadmin[21041]: -- unavailable modifier requested: 0 --
Aug 24 02:37:20 mxserver iredadmin[21041]: -- unavailable modifier requested: 0 --
Aug 24 02:37:26 mxserver iredadmin[21041]: -- unavailable modifier requested: 0 --
Aug 24 02:37:28 mxserver iredadmin[21041]: -- unavailable modifier requested: 0 --
Aug 24 02:37:42 mxserver iredadmin[21041]: -- unavailable modifier requested: 0 --
Aug 24 02:42:06 mxserver iredadmin[21041]: -- unavailable modifier requested: 0 --
Aug 24 02:42:29 mxserver iredadmin[21041]: -- unavailable modifier requested: 0 --
Aug 24 02:42:36 mxserver iredadmin[21041]: -- unavailable modifier requested: 0 --
and syslog:
Aug 24 02:35:01 mxserver CRON[22071]: (root) CMD (/bin/bash /usr/local/bin/fail2ban_banned_db unban_db
Aug 24 02:36:01 mxserver CRON[22114]: (root) CMD (/bin/bash /usr/local/bin/fail2ban_banned_db unban_db
Aug 24 02:37:01 mxserver CRON[22138]: (root) CMD (/bin/bash /usr/local/bin/fail2ban_banned_db unban_db
Aug 24 02:37:20 mxserver iredadmin: -- unavailable modifier requested: 0 --
Aug 24 02:37:26 mxserver iredadmin: -- unavailable modifier requested: 0 --
Aug 24 02:37:42 mxserver iredadmin: message repeated 2 times: [ -- unavailable modifier requested: 0 -
Aug 24 02:38:01 mxserver CRON[22163]: (root) CMD (/bin/bash /usr/local/bin/fail2ban_banned_db unban_db
Aug 24 02:39:01 mxserver CRON[22192]: (root) CMD ( [ -x /usr/lib/php/sessionclean ] && if [ ! -d /run /systemd/system ]; then /usr/lib/php/sessionclean; fi)
Aug 24 02:39:01 mxserver CRON[22193]: (root) CMD (/bin/bash /usr/local/bin/fail2ban_banned_db unban_db
Aug 24 02:39:07 mxserver systemd[1]: Starting Clean php session files...
Aug 24 02:39:08 mxserver systemd[1]: phpsessionclean.service: Succeeded.
Aug 24 02:39:08 mxserver systemd[1]: Finished Clean php session files.
Aug 24 02:40:01 mxserver CRON[22287]: (root) CMD (/bin/bash /usr/local/bin/fail2ban_banned_db unban_db
Aug 24 02:41:01 mxserver CRON[22311]: (root) CMD (/bin/bash /usr/local/bin/fail2ban_banned_db unban_db
Aug 24 02:42:01 mxserver CRON[22339]: (root) CMD (/bin/bash /usr/local/bin/fail2ban_banned_db unban_db
Aug 24 02:42:06 mxserver iredadmin: -- unavailable modifier requested: 0 --
Aug 24 02:42:29 mxserver iredadmin: -- unavailable modifier requested: 0 --
Aug 24 02:42:36 mxserver iredadmin: -- unavailable modifier requested: 0 --
Aug 24 02:43:01 mxserver CRON[22377]: (root) CMD (/bin/bash /usr/local/bin/fail2ban_banned_db unban_db
Aug 24 02:44:01 mxserver CRON[22410]: (root) CMD (/bin/bash /usr/local/bin/fail2ban_banned_db unban_db