Symptoms
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The following error pops up after logging into Roundcube WebMail:
Connection to storage server failed
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Unable to send a message using Roundcube webmail with the following error:
SMTP Error (-1): Connection to server failed
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The entries like below can be found in
/var/log/maillog:admin dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, TLS handshaking: SSL_accept() failed: error:14094415:SSL routines:SSL3_READ_BYTES:sslv3 alert certificate expired: SSL alert number 45, session=
OR
CONFIG_TEXT: Jun 24 23:12:38 hostname postfix/smtpd[2273742]: warning: TLS library problem: error:14094415:SSL routines:SSL3_READ_BYTES:sslv3 alert certificate expired:s3_pkt.c:1275:SSL alert number 45:
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The error below is found in the
/var/log/plesk-roundcube/errors:ERROR: stream_socket_client(): unable to connect to ssl://localhost:465 (Unknown error) (0)
ERROR: Failed to connect socket: stream_socket_client(): unable to connect to ssl://localhost:465 (Unknown error) ()
<fav2islm> SMTP Error: Connection failed: Failed to connect socket: stream_socket_client(): unable to connect to ssl://localhost:465 (Unknown error) in /usr/share/psa-roundcube/program/lib/Roundcube/rcube.php on line 1667 (POST /?_task=mail&_unlock=loading1533740030256&_lang=es&_framed=1&_action=send) -
While checking the certificate on mail server (replace example.com with the valid domain name or hostname), it can be seen that certificate expired:
# echo | openssl s_client -connect example.com:465 -servername example.com 2>/dev/null | grep 'Verify return code'
Verify return code: 10 (certificate has expired)
Cause
Mail server SSL/TLS certificate expired.
Resolution
Renew the certificate for Mail Server.
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Log in to Plesk
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Follow the instructions here: update the mail server's certificate
Additional information
Unable to log into RoundCube: Connection to storage server failed