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.
