Roundcube: SMTP Error (): Authentication failed. :SOLVED

ISPCONFIG perfect server, Apache , Debian 11 > Then upgraded to Debian 12 and everything from the new perfect server tutorial.
Empty serve. One domain, one postmaster account for testing.
Roundcube to send a test mail to another account and it doesnt send.
Red popup in the lower right corner "SMTP Error (): Authentication failed."

/etc/roundcube/config.inc.php
$config['default_host'] = 'localhost';
$config['smtp_server'] = '%h';
$config['smtp_port'] = 25;
$config['smtp_user'] = '%u';
$config['smtp_pass'] = '%p';
$config['support_url'] = '';
$config['product_name'] = 'Roundcube Webmail';

What else should i check or change?
Best regards

 

Is this a new server you set up by installing Debian 11 and ISPConfig, then upgrading that to Debian 12? Did you follow https://www.howtoforge.com/how-to-upgrade-from-debian-11-to-debian-12/

 

Hi Till, i tried changing only the port to 587, with no result.
Should i change localhost to tls://localhost, or localhost:587 or anything?
Should i restart apache and postfix afterwards?
Re:Taleman > I followed both, the upgrade procedure and double checked the whole Perfect server deb12

 

OK, a little progress.
If i put:
$config['default_host'] = 'localhost';
$config['smtp_server'] = 'localhost:25';
$config['smtp_port'] = 25;

Then it works

But then , if i want to use TLS it doesnt:
$config['default_host'] = 'localhost';
$config['smtp_server'] = 'localhost:587';
$config['smtp_port'] = 587;

 

OK, SOLVED with localhost:25