Within Plesk’s Apache logs browser feature, there are a few different types of Apache logs. Each log type has a distinct purpose and if utilized correctly can help troubleshoot any server problems that might arise. You might be trying to track down the reason a site has suddenly gone down. Checking the log type below will determine the cause.
Apache error (error_log). This log contains diagnostic information. It also records any errors that the Apache web server encounters in processing requests.