I’m gonna guess that Asterisk is not running, or the credentials/ACL for your user is not set correctly. Check /var/log/asterisk/full for more information on what is trying to access the server and which condition is causing the fault.
This can also happen in the firewall decides to blacklist your source address as well, so you might want to check that.
Asterisk is running fine! Also i checked the full-log, there’s no entry that appears every two minutes!
i am sorry, i forgot to mention an important information, the causing script is:
Cron asterisk@asterisk [ -x /var/www/html/admin/modules/dashboard/scheduler.php ] && /var/www/html/admin/modules/dashboard/scheduler.php
…so localhost, no firewall involved.
sorry al for taking your time! you are right, this happens, because asterisk is not running. the mails came from a completely different machine then i expected!
so, this is solved. thanks all for giving me the right hints!