On 02/02/2021 14:59 Wolfgang adminkram@tripelspark.de wrote:
Hi,
Web search turned no results to this problem:
We have a small site running private e-mail for maybe 12 people, dovecot is used by Postfix-SASL and IMAP clients.
PROBLEM: When starting dovecot, after a few hours, IMAP clients are no longer able to connect. Thunderbird indicates that connection is refused.
On the server, we see 100 dovecot/imap-login processes. This is the process limit. If we increase the process limit to 200, same thing, we survive a few hours longer but eventually we're seeing 200 imap-login processes and rejected connections.
When listing TCP connections via lsof, there are only around 30 connections open to IMAP and we have exactly the same amount of dovecot/imap processes. These connections are held by 30 dovecot/imap-login processes.
The other 70 dovecot/imap-login processes seem to do nothing. They're all sitting in "epoll_wait(14," according to strace but don't have TCP connections open.
The only way out of this that we have found is re-starting dovecot every few hours.
BTW, service_count = 1 for improved security. Dovecot Version: 2.3.4.1 (f79e8e7e4)
Interestingly we were using nearly the same config on our old server with 2.2.13 and did not see this issue.
Any ideas how to solve that properly?
Thank you, Wolfgang
Hi!
Can you provide output of doveconf -n? Also, would it be possible to try out with latest version at https://repo.dovecot.org?
Aki