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