Dovecot and Self-signed issue

[Tony]

It does look like a client issue. Do you also have some kind of AV
running? There are some AV software that can sometimes interfere with
mail sessions. See if you might be running into a similar situation:
https://support.mozilla.org/en-US/questions/1066126

Cheers,
--
TC

On 9/25/17 1:27 PM, Michael A. Peters wrote:
> I use dovecot on several servers. One of them uses a self-signed cert,
> it's just me.
>
> It worked fine until yesterday when I upgraded my desktop (NOT the
> server) to CentOS 7.4
>
> Now thunderbird complains when it starts up, and won't let me confirm
> the security exception.
>
> On the server the following error occurs in the log:
>
> Sep 25 20:17:49 librelamp dovecot: imap-login: Disconnected (no auth
> attempts in 1 secs): user=<>,
> rip=2600:1010:b064:f260:e83e:562d:2316:18df,
> lip=2600:3c01::f03c:91ff:fee4:310c, TLS handshaking: SSL_accept()
> failed: error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert
> unknown ca: SSL alert number 48,
> session=<u7agQAlasK8mABAQsGTyYOg+Vi0jFhjf>
>
> I believe this is a client issue, as it worked just fine in CentOS 7.3
> client, but I am hoping this has been seen and fixed before.