IMAP Timeouts

[Alexander Dalloz]

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

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