==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.1
- Deployed with iRedMail Easy or the downloadable installer?
- Linux/BSD distribution name and version: Downloadable installer
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): Ubuntu 18.04.2 LTS
- Web server (Apache or Nginx):Nginx
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hello, the server stopped working properly over the weekend.

Roundcube:
SMTP error (-1) Connection to server failed.

syslog:
Sep 27 08:18:15 mail rsyslogd: action 'action 9' suspended (module 'builtin:omfile'), retry 0. There should be messages before this one giving the reason for suspension. [v8.32.0 try http://www.rsyslog.com/e/2007 ]
Sep 27 08:18:15 mail rsyslogd: action 'action 9' resumed (module 'builtin:omfile') [v8.32.0 try http://www.rsyslog.com/e/2359 ]
Sep 27 08:18:25 mail roundcube: PHP Warning:  stream_socket_client(): unable to connect to 127.0.0.1:587 (Connection refused) in /opt/www/roundcubemail-1.4.7/vendor/pear/net_socket/Net/Socket.php on line 159
Sep 27 08:18:25 mail roundcube: <pkqu1l3n> PHP Error: Connection refused (POST /mail/?_task=mail&_unlock=loading1632730705879&_framed=1&_lang=en&_action=send)
Sep 27 08:18:25 mail roundcube: <pkqu1l3n> PHP Error: Failed to connect socket: Connection refused (POST /mail/?_task=mail&_unlock=loading1632730705879&_framed=1&_lang=en&_action=send)
Sep 27 08:18:25 mail roundcube: <pkqu1l3n> SMTP Error: Connection failed: Failed to connect socket: Connection refused in /opt/www/roundcubemail-1.4.7/program/lib/Roundcube/rcube.php on line 1702 (POST /mail/?_task=mail&_unlock=loading1632730705879&_framed=1&_lang=en&_action=send)

mail.log:
Sep 27 08:22:08 mail roundcube: PHP Warning:  stream_socket_client(): unable to connect to 127.0.0.1:587 (Connection refused) in /opt/www/roundcubemail-1.4.7/vendor/pear/net_socket/Net/Socket.php on line 159
Sep 27 08:22:08 mail roundcube: <ubraklcg> PHP Error: Connection refused (POST /mail/?_task=mail&_unlock=loading1632730928867&_framed=1&_lang=en&_action=send)
Sep 27 08:22:08 mail roundcube: <ubraklcg> PHP Error: Failed to connect socket: Connection refused (POST /mail/?_task=mail&_unlock=loading1632730928867&_framed=1&_lang=en&_action=send)
Sep 27 08:22:08 mail roundcube: <ubraklcg> SMTP Error: Connection failed: Failed to connect socket: Connection refused in /opt/www/roundcubemail-1.4.7/program/lib/Roundcube/rcube.php on line 1702 (POST /mail/?_task=mail&_unlock=loading1632730928867&_framed=1&_lang=en&_action=send)

dovecot.log:
Sep 27 06:52:43 mail dovecot: dict(2858): Error: mysql(127.0.0.1): Connect failed to database (iredadmin): Can't connect to MySQL server on '127.0.0.1' (111) - waiting for 5 seconds before retry
Sep 27 06:52:43 mail dovecot: dict(2858): Error: mysql(127.0.0.1): Connect failed to database (iredadmin): Can't connect to MySQL server on '127.0.0.1' (111) - waiting for 5 seconds before retry

Password for iredadmin same in /opt/www/iredadmin/settings.py and dovecot configs.