[Dovecot] Dovecot ok for port 110, but not for SSL (beginner asking)

[ycc_Swe]

Hello,

I just installed Dovecot. It works for plaintext autorization, port 110. It
has connected with Telnet, Thunderbird and an on-line pop3 client.

Telnet:
+OK Dovecot ready.
user nnnnn
-ERR Unknown command.
user nnnnn
+OK
pass xxxxxxxxxx
+OK Logged in.
stat
+OK 1 1553
retr 1
+OK 1553 octets
Return-path: <sssssss at hotmail.com>
Envelope-to: nnnnnn at mydomain.com
Delivery-date: Tue, 06 Nov 2012 12:02:28 +0100
Received: from bay0-xcvxcv-xvxcv.bay333.hotmail.com ([123.123.123.123])
        by deb7.pc with esmtp (Exim 4.80)

But when I try ssl (port 995) with an on-line pop3 client, it will not work:
/var/log/mail.log
Nov  7 02:46:55 deb7 dovecot: pop3-login: Disconnected (no auth attempts in
0 secs): user=<>, rip=12.12.12.7, lip=123.123.123.123, TLS: Disconnected,
session=<Iza75N3NlABBNykH>
Nov  7 02:46:56 deb7 dovecot: pop3-login: Disconnected (no auth attempts in
1 secs): user=<>, rip=12.12.12.7, lip=123.123.123.123, TLS: Disconnected,
session=<nWTF5N3NlQBBNykH>

root at deb7:~# doveconf -n
# 2.1.7: /etc/dovecot/dovecot.conf
# OS: Linux 3.2.0-3-686-pae i686
disable_plaintext_auth = no
mail_gid = mail
mail_location = mbox:~/mail:INBOX=/var/mail/%u
namespace inbox {
  inbox = yes
  location =
  prefix =
}
passdb {
  args = username_format=%u /etc/dovecot/users
  driver = passwd-file
}
plugin {
  sieve = ~/.dovecot.sieve
  sieve_dir = ~/sieve
}
protocols = " imap pop3"
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
  args = username_format=%u /etc/dovecot/users
  driver = passwd-file
}

I know very little about mail and ssl. I have assumed that ssl will be set
up "automatically" when Dovecot is installed. But maybe I have missed
something here. Please give me pointers.
The following two files contain ssl keys:
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem

I have tried changing the ssl parameter ("yes", "required") in 10-ssl.conf
but with no change except that port 110 login becomes disabled.

As you can see I am a beginner with Dovecot, I hope it is still OK to ask on
this mailing list. Thanks.



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