Issue connecting to dovecot from remote machine

[Antoine Sirven]

Hi,
I've set up a postfix +dovecot configuration on my debian jessie.
But I have a connection issue. When I try to connect from thunderbird it
doesn not work. When I check out my debug logs I get :
 auth-worker(22252): Info: pam(myuser,hostIP): pam_authenticate()
failed: Authentication failure (password mismatch?) (given password:
correctPassword)

Running doveadm auth test tells me I can authenticate with the same
password.
So I tried connecting via openssl.
When I connect from my local host, everything goes fine :
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE
IDLE AUTH=PLAIN AUTH=LOGIN AUTH=CRAM-MD5] Dovecot ready.
a login myUser myPassword
a OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE
IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS
THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN
NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH
ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS SPECIAL-USE BINARY
MOVE] Logged in


But when I run the same thing from my remote laptop, I never get any
reply from the imap server. It's as if the request wasn't reaching the
server. Although I do get a first reply from the server, I just can't
log in.
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE
IDLE AUTH=PLAIN AUTH=LOGIN AUTH=CRAM-MD5] Dovecot ready.
a login myUser myPassword

(... and then nothing...)

The port is properly open when I run nmap.
I really don't get what's wrong.
Any of you has any idea?
Here are my versions & conf :

# dovecot -n
# 2.2.13: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-042stab120.16 x86_64 Debian 8.7
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login cram-md5
auth_verbose = yes
auth_verbose_passwords = yes
disable_plaintext_auth = no
info_log_path = /var/log/maildebug.log
mail_debug = yes
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 {
  args = failure_show_msg=yes session=yes dovecot
  driver = pam
}
passdb {
  args = username_format=%u /etc/dovecot/users
  driver = passwd-file
}
protocols = " imap"
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-userdb {
    group = postfix
    mode = 0666
    user = postfix
  }
}
service imap-login {
  inet_listener imap {
    port = 0
  }
  inet_listener imaps {
    port = 993
    ssl = yes
  }
}
service pop3-login {
  inet_listener pop3 {
    port = 0
  }
  inet_listener pop3s {
    port = 0
  }
}
ssl = required
ssl_cert = </etc/ssl/certs/mailcert.pem
ssl_key = </etc/ssl/private/mail.key
userdb {
  driver = passwd
}
userdb {
  args = username_format=%u /etc/dovecot/users
  driver = passwd-file
}
verbose_ssl = yes



Thanks a lot