Dovecot imap connection

Hello,
I have a multiple server ISPC3.2.5 conf
I face difficulty to connect (imap) my roundcube installed on my web server to my mail server with dovecot.
I had these settings

Code:

$config["default_host"] = "ssl://mail1.dgtz.fr/";
$config["default_port"] = 993;
$config["imap_auth_type"] = "LOGIN" ;

It refuses to work.
But this conf works

Code:

$config["default_host"] = "tls://mail1.dgtz.fr/";
$config["default_port"] = 143;
$config["imap_auth_type"] = "LOGIN" ;

I don't understand why, because my thunderbird is connected through 143/STARTTLS when my nextcloud instance is through 993/SSL on the same mail server.

any idea ?

 

I think it is coming from autologon addon.
It was pointing on 127.0.0.1 with autologon !
I remove it, roundcube behavior recover its stability.

I set up

Code:

$config["default_host"] = "tls://mail1.dgtz.fr/";
$config["default_port"] = 143;
$config["imap_auth_type"] = "PLAIN" ;