dovecot - Apr 2007 - Disconnected for inactivity in reading our output top=0/0

Would someone please help with this error.

Using: dovecot-1.0-2.rc28.fc6
On: Fedora Core 6

130 users all connect remotely via ADSL to server to pop their email.
None of them have any problems at all with pop3.
3 users in one office, connect to the server via a NAT'd ADSL.

Intermittently those three users will get a timeout error,
Logfile shows:



Apr 19 12:50:53 mail dovecot: auth(default): pam(vu0095,165.228.62.107):
lookup service=dovecot
Apr 19 12:50:53 mail dovecot: auth(default): client out: OK     1
user=vu0095
Apr 19 12:50:53 mail dovecot: auth(default): master in: REQUEST 376
12300   1
Apr 19 12:50:53 mail dovecot: auth(default): passwd(vu0095,165.228.62.107):
lookup
Apr 19 12:50:53 mail dovecot: auth(default): master out: USER   376
vu0095  system_user=vu0095      uid=580 gid=580 home=/home/vu0095
Apr 19 12:50:53 mail dovecot: pop3-login: Login: user=<vu0095>,
method=PLAIN, rip=165.228.62.107, lip=203.36.211.209
Apr 19 12:51:49 mail dovecot: POP3(vu0095): Disconnected for inactivity in
reading our output top=0/0, retr=1/0, del=0/2, size=25266
Apr 19 12:51:49 mail dovecot: POP3(vu0095): Disconnected: Logged out
top=0/0, retr=2/25393, del=2/2, size=25266


99% of the time everything is perfect, it is only the three users in the one
office that get this error, it is of course the head office for the customer
and so they are very upset, because they get timeout errors on their email
clients.

They are using different versions of outlook, and outlook express, I have
deactivated all nortons email scanning etc

Have set the three email clients to pop mail at different times, eg. 7, 13,
17 minutes to try an avoid the possibility of simultaneous pop requests from
the one IP address.

Dovecot -n

# /etc/dovecot.conf
protocols: pop3 pop3s
listen: *
ssl_disable: yes
login_dir: /var/run/dovecot/login
login_executable: /usr/libexec/dovecot/pop3-login
login_greeting: POP Server ready.
login_processes_count: 20
mail_executable: /usr/libexec/dovecot/pop3
mail_plugin_dir: /usr/lib/dovecot/pop3
pop3_client_workarounds: outlook-no-nuls oe-ns-eoh
auth default:
  verbose: yes
  debug: yes
  debug_passwords: yes
  passdb:
    driver: pam
  userdb:
    driver: passwd

On 4/19/07, Chris Gosley <cg at imagatec.com.au>
wrote:
> Apr 19 12:51:49 mail dovecot: POP3(vu0095): Disconnected for inactivity in
> reading our output top=0/0, retr=1/0, del=0/2, size=25266
>
We have a similiar situation every few weeks. Outlook gets confused by
a certain (spam) message in the inbox. If we remove the message (using
the imap web mail frontend) the problem is gone.

As you can see in your log file, one message is downloaded (retr=1/0).
I _think_ the client does not recognize the end of the message for
whatever reason and then waits forever.

Unfortunately I did not have time to investigate the problem further.
Our system is dovecot rc17, maybe upgrading to 1.0 helps.

Chris

On Thu, 2007-04-19 at 13:36 +1000, Chris Gosley wrote:
> Apr 19 12:51:49 mail dovecot: POP3(vu0095): Disconnected for inactivity in
> reading our output top=0/0, retr=1/0, del=0/2, size=25266
> Apr 19 12:51:49 mail dovecot: POP3(vu0095): Disconnected: Logged out
> top=0/0, retr=2/25393, del=2/2, size=25266
> 
> 
> 99% of the time everything is perfect, it is only the three users in the
one
> office that get this error, it is of course the head office for the
customer
> and so they are very upset, because they get timeout errors on their email
> clients.
> 
> They are using different versions of outlook, and outlook express, I have
> deactivated all nortons email scanning etc
Did you figure out anything? Enabling rawlog
(http://dovecot.org/bugreport.html) for those users and looking at them
might show if the mails contain something special that causes the client
(or Dovecot) to break.

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