dovecot: imap-login: Aborted login (no auth attempts)

Hi, I’m using Virtualmin and I’ve just installed it on VPS machine.
But I can’t imap login using Thunderbird. The following was written in the log:

Dec 6 19:46:20 www dovecot: pop3-login: Aborted login (no auth attempts): rip=..., lip=...
Dec 6 19:46:41 www dovecot: imap-login: Aborted login (no auth attempts): rip=..., lip=...

Previously I’ve never met such a problem, the others all worked.

Login from Windows command prompt was done successfully:

telnet hostname 143

  • OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=PLAIN AUTH=LOGIN] Dovecot ready.
    1 login “username” “password”
    1 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORTSORT=DISPLAY THREAD=REFERENCES THREAD=REFS MULTIAPPEND UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS] Logged in
    2 logout
  • BYE Logging out
    2 OK Logout completed.

Here is the result of dovecot -n.

2.0.9: /etc/dovecot/dovecot.conf

OS: Linux 2.6.32-358.0.1.el6.x86_64 x86_64 CentOS release 6.4 (Final)

auth_mechanisms = plain login
disable_plaintext_auth = no
mail_location = maildir:~/Maildir
mbox_write_locks = fcntl
passdb {
driver = pam
}
protocols = imap pop3
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key = </etc/pki/dovecot/private/dovecot.pem
userdb {
driver = passwd
}
protocol pop3 {
pop3_uidl_format = %08Xu%08Xv
}

No email is reached though I sent several emails to the server from gmail.
Anyone please tell me what is going on.

Looks like a Thunderbird problem to me. You might want to delete and re-create the account in Thunderbird and try different settings for connection, like SSL/no SSL, and plain text login vs. encrypted login.

Thank you for your reply.
Firstly I thought it was a Thunderbird problem, but it isn’t.
The test mail I sent from gmail account got back, it wrote

Delivery to the following recipient has been delayed:

 info@********.com

Message will be retried for 2 more day(s)

Technical details of temporary failure:
The recipient server did not accept our requests to connect. Learn more at http://support.google.com/mail/bin/answer.py?answer=7720
[(5) mail..com. [:::::]:25: Connection refused]
[(5) mail.
.com. [...]:25: Connection refused]

So I checked whether postfix worked, and eventually I restarted postfix and it worked!
I don’t know what’s happened still now, but anyway I can keep using Virtualmin.
Thank you.