==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.2 MariaDB Edition
- Deployed with iRedMail Easy or the downloadable installer? Dowloadable
- Linux/BSD distribution name and version: CentOS 8
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx):Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Nov 26 17:49:03 mail mysqld[1210]: 2020-11-26 17:49:03 6458 [Warning] Aborted connection 6458 to db: 'vmail' user: 'vmailadmin' host: 'localhost' (Got an error reading communication packets)s==> /var/log/messages <==
Nov 26 18:01:01 mail systemd[1]: Started Session 974 of user root.
Nov 26 18:01:01 mail mysqld[1210]: 2020-11-26 18:01:01 6627 [Warning] Aborted connection 6627 to db: 'vmail' user: 'vmailadmin' host: 'localhost' (Got an error reading communication packets)
Nov 26 18:01:01 mail mysqld[1210]: 2020-11-26 18:01:01 6628 [Warning] Aborted connection 6628 to db: 'iredadmin' user: 'iredadmin' host: 'localhost' (Got an error reading communication packets)
Nov 26 18:01:01 mail mysqld[1210]: 2020-11-26 18:01:01 6626 [Warning] Aborted connection 6626 to db: 'iredapd' user: 'iredapd' host: 'localhost' (Got an error reading communication packets)
Nov 26 18:01:03 mail mysqld[1210]: 2020-11-26 18:01:03 6616 [Warning] Aborted connection 6616 to db: 'vmail' user: 'vmailadmin' host: 'localhost' (Got an error reading communication packets)
Nov 26 18:01:11 mail mysqld[1210]: 2020-11-26 18:01:11 6615 [Warning] Aborted connection 6615 to db: 'vmail' user: 'vmailadmin' host: 'localhost' (Got an error reading communication packets)
Nov 26 18:02:01 mail systemd[1]: Started Session 975 of user root.
Nov 26 18:02:01 mail systemd[1]: Started Session 976 of user root.
Nov 26 18:02:27 mail mysqld[1210]: 2020-11-26 18:02:27 6631 [Warning] Aborted connection 6631 to db: 'iredapd' user: 'iredapd' host: 'localhost' (Got an error reading communication packets)
Nov 26 18:03:01 mail systemd[1]: Started Session 977 of user root.

This pops from var/log/messages