connection closes every 10 minutes
Greetings,
I use mutt on Ubuntu to access my IMAP mailboxes, on my Centos email server that runs dovecot. Everything has worked without problems for years. About one week ago, the connection between mutt and dovecot became unstable.
Before, I could leave mutt connected for days in a row, no problem. Now, everything still works fine, except... I get every ten minutes I get "connection timed out" in Mutt's status line, and hundreds of messages like
Apr 12 16:12:49 SERVERNAME dovecot: imap(ACCOUNTNAME): Logged out in=164 out=757
what puzzles me is that I did not touch anything both on my server and on my desktop, except an "apt-get update" some days before this started.
But cannot see how it would be related anyway, nor have I found anything online like this.
Any help to understand what happened and fix it is very welcome.
Marco
On 12 Apr 2021, at 16:47, Marco Fioretti <marco.fioretti@gmail.com> wrote:
Apr 12 16:12:49 SERVERNAME dovecot: imap(ACCOUNTNAME): Logged out in=164 out=757
This log line means that the connection with the server is terminated gracefully, with the client issuing a "LOGOUT" command. That makes me think the issue is on your mutt client's end and not with dovecot.
Best regards, Eirik
update on this:
to make a long story short....
I did run mutt with debug enabled , but could not recognize anything useful
I had the same problem with mutt from my laptop
a few days ago I received a new modem from my ISP, as part of their network upgrade operations
more or less in the same moment the problem I reported here disappeared. Now mutt stays connected even 24 hours without losing connection.
I am NOT 100% sure that the problem disappeared AFTER the change of modem. That happened during a few chaotic days, both work- and family-wise, so I did not take notes. And modems may have nothing to do at all with the disconnections. But now the problem is not there anymore, I have no clue what may have happened, and if anybody can guess... thanks in advance.
Il giorno lun 12 apr 2021 alle ore 16:47 Marco Fioretti <marco.fioretti@gmail.com> ha scritto:
Greetings,
I use mutt on Ubuntu to access my IMAP mailboxes, on my Centos email server that runs dovecot. Everything has worked without problems for years. About one week ago, the connection between mutt and dovecot became unstable.
Before, I could leave mutt connected for days in a row, no problem. Now, everything still works fine, except... I get every ten minutes I get "connection timed out" in Mutt's status line, and hundreds of messages like
Apr 12 16:12:49 SERVERNAME dovecot: imap(ACCOUNTNAME): Logged out in=164 out=757
what puzzles me is that I did not touch anything both on my server and on my desktop, except an "apt-get update" some days before this started.
But cannot see how it would be related anyway, nor have I found anything online like this.
Any help to understand what happened and fix it is very welcome.
Marco
On Mon, 26 Apr 2021, Marco Fioretti wrote:
a few days ago I received a new modem from my ISP, as part of their network upgrade operations
more or less in the same moment the problem I reported here disappeared. Now mutt stays connected even 24 hours without losing connection.
I am NOT 100% sure that the problem disappeared AFTER the change of modem. That happened during a few chaotic days, both work- and family-wise, so I did not take notes. And modems may have nothing to do at all with the disconnections. But now the problem is not there anymore, I have no clue what may have happened, and if anybody can guess... thanks in advance.
Does this modem also have an integrated router? These units tend to act as NAT gateways/firewalls that keep track of "active" sessions by tracking external/interface NAT address mappings. Cheap or older one could have TTL on these entries i.e. if no traffic is detected within a time window, it is discarded, and appearing as if the endpoints had disconnected. I guess it could also happen if the state tracking tables has limited memory and your internal network is busy, like a family member opening up a P2P application.
Just a hypothesis.
Apr 12 16:12:49 SERVERNAME dovecot: imap(ACCOUNTNAME): Logged out in=164 out=757
However, my hypothesis wouldn't produce this. This is a active logout.
Joseph Tam <jtam.home@gmail.com>
Hi,
I honestly don't know if the old modem had an integrated router, and I have already disposed of it. What I am sure of is that I had NOT changed anything in its settings for many months, if not years, and everything was working without problems until a few weeks ago, when I posted here.
Marco
Il giorno mar 27 apr 2021 alle ore 23:49 Joseph Tam <jtam.home@gmail.com> ha scritto:
On Mon, 26 Apr 2021, Marco Fioretti wrote:
a few days ago I received a new modem from my ISP, as part of their network upgrade operations
more or less in the same moment the problem I reported here disappeared. Now mutt stays connected even 24 hours without losing connection.
I am NOT 100% sure that the problem disappeared AFTER the change of modem. That happened during a few chaotic days, both work- and family-wise, so I did not take notes. And modems may have nothing to do at all with the disconnections. But now the problem is not there anymore, I have no clue what may have happened, and if anybody can guess... thanks in advance.
Does this modem also have an integrated router? These units tend to act as NAT gateways/firewalls that keep track of "active" sessions by tracking external/interface NAT address mappings. Cheap or older one could have TTL on these entries i.e. if no traffic is detected within a time window, it is discarded, and appearing as if the endpoints had disconnected. I guess it could also happen if the state tracking tables has limited memory and your internal network is busy, like a family member opening up a P2P application.
Just a hypothesis.
Apr 12 16:12:49 SERVERNAME dovecot: imap(ACCOUNTNAME): Logged out in=164 out=757
However, my hypothesis wouldn't produce this. This is a active logout.
Joseph Tam <jtam.home@gmail.com>
participants (3)
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Eirik Rye
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Joseph Tam
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Marco Fioretti