[Discuss] dovecot: "Disconnected (no auth attempts in 0 secs)"?

[Daniel Barrett]

>>On 12/17/20 9:38 AM, Daniel Barrett wrote:
>>> I've started using dovecot for the first time (on localhost, to serve
>>> IMAP folders locally) and keep seeing this message repeated in the
>>> log:
>>>    imap-login: Info: Disconnected (no auth attempts in 0 secs): user=<>, ...
>>> 
>>> Does anybody know if this indicates a problem that needs fixing?
>>>The full story, config file, & logs are in this Stack Overflow
>>>question I posted a few days ago, if anybody knows the answer:
>>>
>>>  https://stackoverflow.com/questions/65296088/why-does-dovecot-on-localhost-repeat-disconnected-no-auth-attempts-in-0-secs

>Kent Borg wrote: 
>> I see them in my log file. My guess, at least in my case: Someone on the
>> open internet (judging by the IP) was trying to break in but quit talking
>> when authentication was expected.

On December 17, 2020, Dan Ritter wrote:
>Yup, this. Nuisance value.

Thanks for the guesses, but I'm pretty sure in my case something else
is happening. The computer in question is firewalled from all incoming
requests from the internet, and as mentioned, the IMAP server is
accessible only via localhost. More detail from the Stack Overflow
writeup mentioned above:

  Dec 14 14:36:18 imap-login: Info: Disconnected (no auth attempts in 0 secs):
  user=<>, rip=127.0.0.1, lip=127.0.0.1, secured, session=<ezeLwXG2K+F/AAAB>

Also the messages appear every 30 minutes like clockwork.

My best guess is that one of the (several) IMAP clients on the
computer is disconnecting every 30 minutes, but I don't know if this
is due to a misconfiguration or just normal behavior...?

Dan