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My problem surfaced after the Ubuntu 16.04 upgrade to Ubuntu 18.04.02. Both Outlook client and Thunderbird client fail to connect to the IMAP server. I include some information about my configuration, hoping that someone can help.

==========================

$ dovecot -n



# 2.2.33.2 (d6601f4ec): /etc/dovecot/dovecot.conf

# Pigeonhole version 0.4.21 (92477967)

# OS: Linux 4.15.0-45-generic x86_64 Ubuntu 18.04.2 LTS



mail_location = mbox:~/mail:INBOX=/var/mail/%u

mail_privileged_group = mail

namespace inbox {

  inbox = yes

  location =

  mailbox Drafts {

    special_use = Drafts

  }



  mailbox Junk {

    special_use = Junk

  }



  mailbox Sent {

    special_use = Sent

  }



  mailbox "Sent Messages" {

    special_use = Sent

  }



  mailbox Trash {

    special_use = Trash

  }



  prefix =

}



passdb {

  driver = pam

}



protocols = " imap pop3"



ssl_cert = </usr/local/ssl/mydomain/certs/linux.pem

ssl_client_ca_dir = /usr/local/ssl/mydomain/certs

ssl_key =  # hidden, use -P to show it



userdb {

  driver = passwd

}

Where "linux.pem" is a CA certificate (not self-signed) and working well with Apache 2.

==================================

The /var/log/auth.log doesn't show errors when I try to open the client, but the mail.log shows:

Feb 19 19:23:18 linux dovecot: master: Dovecot v2.2.33.2 (d6601f4ec) starting up

 for imap, pop3 (core dumps disabled)

Feb 19 19:23:38 linux dovecot: imap-login: Disconnected (auth failed, 1 attempts

 in 2 secs): user=<ilasa01>, method=PLAIN, rip=172.19.0.25, lip=172.19.0.4, TLS

: Disconnected, session=<QYaGLUSCX/SsEABr>

Feb 19 19:23:45 linux dovecot: imap-login: Disconnected (auth failed, 1 attempts

 in 6 secs): user=<ilasa01>, method=PLAIN, rip=172.19.0.25, lip=172.19.0.4, TLS

If I change the passwd {
driver = shadow
}
in authconf-system.con.ext, then the /var/log/auth.log shows the following error:

linux auth: pam_winbind(dovecot:auth): request wbcLogonUser fail
ed: WBC_ERR_AUTH_ERROR, PAM error: PAM_USER_UNKNOWN (10), NTSTATUS: NT_STATUS_NO
_SUCH_USER, Error message was: The specified account does not exist.
Feb 19 19:43:44 linux auth: pam_unix(dovecot:auth): authentication failure; logn
ame= uid=0 euid=0 tty=dovecot ruser=ilasa01 rhost=172.19.0.25 user=ilasa01
Feb 19 19:43:44 linux auth: pam_winbind(dovecot:auth): getting password (0x00000
388)
Feb 19 19:43:44 linux auth: pam_winbind(dovecot:auth): pam_get_item returned a p
assword
Feb 19 19:43:44 linux auth: pam_winbind(dovecot:auth): request wbcLogonUser fail
ed: WBC_ERR_AUTH_ERROR, PAM error: PAM_USER_UNKNOWN (10), NTSTATUS: NT_STATUS_NO
_SUCH_USER, Error message was: The specified account does not exist.

Any idea about the problem, please?

Thanks.