[Freedombox-discuss] Cannot connect to internal imap server from Roundcube.

[A. F. Cano]

On Tue, Aug 02, 2022 at 04:31:28PM -0400, A. F. Cano wrote:
> 
> I have set up dovecot on an internal machine. Debian stable up to date.
> It works fine when accessed like this from mutt:
> 
> mutt -f imaps://<IP address of internal machine>/<mailbox>
> 
> >From both the machine where the imap server is and from another machine
> in the internal network, after the usual SSL certificate warning.  Mutt
> prompts for the username and password.
> 
> However, from Roundcube on the FreedomBox it fails:
> 
> In the login page of roundcube I enter the user name, the passowrd and in
> the field of the server address: imaps://<IP address of the imap server>
> 
> and I get "Connection to storage server failed."
> 
> In /var/log/roundcube/errors.log I see this:
> 
> [02-Aug-2022 16:03:47 -0400]: <d1babvua> IMAP Error: Login failed for <user name>  against 192.168.200.<IP of imap server> from 192.168.200.<IP of FreedomBox>. Could not connect to ssl://192.168.200.<IP of imap server>:993: Unknown reason in /usr/share/roundcube/program/lib/Roundcube/rcube_imap.php on line 200 (POST /roundcube/?_task=login&_action=login)
> 
> Is this something I need to tweak in the imap server? What is roundcube
> expecting that it might not be getting?  Any ideas as to how to narrow this
> down?  What specific tests might I do to find out exactly what the problem is?
> 
> Thanks.
> 
> Augustine

And this is what the imap server says:

Aug  2 17:16:17 hp-i3 dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=192.168.200.<IP of FreedomBox>, lip=192.168.200.<IP of imap server>, TLS handshaking: SSL_accept() failed: error:14094418:SSL routines:ssl3_read_bytes:tlsv1 alert unknown ca: SSL alert number 48, session=<AUyIoEjlorfAqMgb>