IMAP Timeouts

[aki.tuomi at dovecot.fi]

> On May 29, 2016 at 1:43 AM Alexander Dalloz <ad+lists at uni-x.org> wrote:
> 
> 
> Am 28.05.2016 um 21:25 schrieb Vince42:
> > Hi,
> >
> > from time to time the IMAP login times out ... my external monitoring
> > says "connection reset by peer (SSL)" and Thunderbird tries to connect
> > forever. After a short while everything returns back to normal operation.
> >
> > The system resources are plenty, there are no error messages and no
> > greedy background tasks running.
> >
> > I read a little about tweaking imap-login - but all the default
> > parameters seem to be set more generously than what was recommended.
> >
> > Where should I start the debugging process?
> >
> > I really wish there was some "dovecot optimizer tool" ... :P
> 

Dovecot optimization is usually only required for large installations.

> That sounds suspiciously as if you are running out of entropy. Is that a 
> virtual machine you are running with dovecot?
> 
> At time when the SSL connection cannot be established check the value of 
> available entropy by
> 
> 	cat /proc/sys/kernel/random/entropy_avail
> 
> In case you see a low value you should consider running a daemon like 
> haveged.
> 
> Alexander

Also make sure you are not facing simple firewall or interconnectivity issue. 

Also usually it helps if you provide outputs from

doveconf -n
doveadm log errors

---
Aki Tuomi