Hi
our log files output
/var/log/mail.log
Jul 18 18:54:48 mepc-08 dovecot: managesieve-login: Aborted login (auth failed, 1 attempts in 5 secs): user=<gurunarayan>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured, session=<hRNU/EVxLQB/AAAB>
Jul 18 18:55:07 mepc-08 dovecot: managesieve-login: Aborted login (auth failed, 1 attempts in 8 secs): user=<gurunarayan>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured, session=<f0lJ/UVxLgB/AAAB>
Jul 18 18:56:45 mepc-08 dovecot: managesieve-login: Aborted login (auth failed, 1 attempts in 4 secs): user=<gurunarayan>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured, session=<m79YA0ZxNgB/AAAB>
Jul 18 18:57:45 mepc-08 dovecot: managesieve-login: Aborted login (auth failed, 1 attempts in 5 secs): user=<gurunarayan>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured, session=<DZXmBkZxOAB/AAAB>
Jul 18 18:58:02 mepc-08 dovecot: managesieve-login: Aborted login (auth failed, 1 attempts in 8 secs): user=<gurunarayan>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured, session=<ULytB0ZxPQB/AAAB>
Jul 18 19:15:21 mepc-08 dovecot: managesieve-login: Aborted login (auth failed, 1 attempts in 4 secs): user=<gurunarayan>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured, session=<LB/eRUZxXwB/AAAB>
Jul 18 19:18:45 mepc-08 dovecot: managesieve-login: Aborted login (auth failed, 1 attempts in 4 secs): user=<gurunarayan>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured, session=<ql8GUkZxZAB/AAAB>
/var/www/html/roundcube/logs/errors
[18-Jul-2018 18:58:02 +0530]: <oiiol3nl> PHP Error: Unable to connect to managesieve on 127.0.0.1:4190 in /var/www/html/roundcube/plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php on line 222 (GET /roundcube/?_task=settings&_action=plugin.managesieve-vacation)
[18-Jul-2018 19:15:21 Asia/Calcutta] ERROR: "Authentication failed." (3)
[18-Jul-2018 19:15:21 +0530]: <oiiol3nl> PHP Error: Unable to connect to managesieve on 127.0.0.1:4190 in /var/www/html/roundcube/plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php on line 222 (GET /roundcube/?_task=settings&_action=plugin.managesieve-vacation)
[18-Jul-2018 19:18:45 Asia/Calcutta] ERROR: "Authentication failed." (3)
[18-Jul-2018 19:18:45 +0530]: <oiiol3nl> PHP Error: Unable to connect to managesieve on 127.0.0.1:4190 in /var/www/html/roundcube/plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php on line 222 (GET /roundcube/?_task=settings&_action=plugin.managesieve-vacation)
and no error log in
/var/log/dovecot