Logfiles can contain useful information for troubleshooting. For example, you might see a directive that is not correctly set up, a syntax error, or even a communications error. Then it is time to review the configuration file, correct the errors, and restart/start the service.
From the moment you install Debian your system will start recording logs. They are sitting on
/var/log, are rotated daily (if needed) and compressed, and you should back them up. There are system-level and application-level logs. You can even enable additional verbosity and/or debugging information by searching the configuration files for
log directives. It is important that you familiarize yourself with ...