Symptoms
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An error is received while trying to login to
webmail.example.com:Connection to storage server failed
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The following errors are found in
/var/log/maillog:PHP Warning: stream_socket_client(): unable to connect to ssl://localhost:993 (Connection refused) in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_imap_generic.php on line 1060
IMAP Error: Login failed for [email protected] against localhost from 203.0.113.2 (X-Forwarded-For: 203.0.113.3). Could not connect to ssl://localhost:993: Connection refused in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_imap.php on line 211 (POST /roundcube/?_task=login&_action=login)
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Dovecot service is not listening on port 993 but 9993 instead:
# netstat -putan | grep 993
tcp 0 0 127.0.0.1:9993 0.0.0.0:* LISTEN 2715700/dovecot
Cause
Plesk Premium Email extension is installed but partially configured or disabled.
Resolution
Apply one of the following solutions:
- Complete the extension configuration from Plesk > Plesk Premium Email
- Remove it from Extensions > My extensions > Plesk Premium Email > Remove (trash icon button) if not used.