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Unable to log in to Roundcube webmail after upgrade to Plesk Onyx 17.8: Connection to storage server failed

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Alisa Kasyanova
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Applicable to:

  • Plesk Onyx for Linux

Symptoms

  • Plesk was upgraded from Onyx 17.5 to Onyx 17.8. As result it is not possible to log in to Roundcube Webmail at http://webmail.example.com, the following error appears in Roudcube UI:

    CONFIG_TEXT: Connection to storage server failed

  • Dovecot is used as IMAP server.

  • The following errors can be found in the file /var/log/plesk-roundcube/errors:

    CONFIG_TEXT: PHP Warning: stream_socket_client(): Failed to enable crypto in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_imap_generic.php on line 959
    PHP Warning: stream_socket_client(): unable to connect to ssl://localhost:993 (Unknown error) in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_imap_generic.php on line 959
    IMAP Error: Login failed for john.doe@example.com from 203.0.113.2(X-Real-IP: 203.0.113.2). Could not connect to ssl://localhost:993: Unknown reason in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_imap.php on line 196 (POST /?_task=login&_action=login)

  • Or the following error is present in the file /var/log/plesk-roundcube/errors:

    CONFIG_TEXT: stream_socket_enable_crypto(): SSL operation failed with code 1.
    OpenSSL Error messages: error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed in /usr/share/psa-roundcube/vendor/pear/net_sieve/Sieve.php on line 1239
    ERROR: Failed to establish TLS connection (2)
    <htjlo6fq> PHP Error: Unable to connect to managesieve on localhost:4190 in /usr/share/psa-roundcube/plugins/managesieve/lib/Roundcube/rcube_sieve_engine.php on line 222 (GET /?_task=settings&_action=plugin.managesieve)
    ERROR: Not currently in AUTHORISATION state (1)
    ERROR: Failed to read from socket ()

  • The following errors may appear in /var/log/maillog

    CONFIG_TEXT: dovecot: managesieve-login: Disconnected (no auth attempts in 1 secs): user=<>, rip=::1, lip=::1, TLS handshaking: SSL_accept() failed: error:14094418:SSL routines:ssl3_read_bytes:tlsv1 alert unknown ca: SSL alert number 48, session=<xxxxxxxxxxxxAAAAAAAAAAAAAAAAAAAAB> * From Roundcube > Configuration > Filter > an error occurs "Can not connect o Managesieve server"

  • The mail server is secured with an SSL certificate in Tools & Settings > SSL/TLS Certificates > Certificate for securing mail.

Cause

Product issue:

Resolution

Please consider updating your server:

Workaround

If update is not possible for some reason you may try the following

workaround

Consider updating Plesk to 17.8.11 MU3.

If the update is not possible, the following workaround can be used:

  1. Connect to the server using SSH.

  2. Backup the configuration files config.inc.php and config.inc.php :

    # cp -a /usr/share/psa-roundcube/config/config.inc.php /root/old_config.inc.php
    # cp -a /usr/share/psa-roundcube/plugins/managesieve/config.inc.php /root/old_config.inc.php

  3. In the file /usr/share/psa-roundcube/config/config.inc.php set the value of the parameter verify_peer and verify_peer_name to false and allow_self_signed to true in $config\['imap_conn_options']" and in "$config['smtp_conn_options']"sections:

    CONFIG_TEXT: $config['imap_conn_options']
    ...
    'verify_peer' => false,
    'verify_peer_name' => false,
    'allow_self_signed' => true,

    CONFIG_TEXT: $config['smtp_conn_options'] = array(
    'ssl' => array(
    'verify_peer' => false,
    'verify_peer_name' => false,
    'allow_self_signed' => true,

  4. Set verify_peer and verify_peer_name to false and allow_self_signed to true in /usr/share/psa-roundcube/plugins/managesieve/config.inc.php

    CONFIG_TEXT: config['managesieve_conn_options'] = array(
    'ssl' => array(
    'verify_peer' => false
    'verify_peer_name' => false,
    'allow_self_signed' => true

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