LinuxHostingSupport

Following is the list of path to different log files on a Plesk server.

Plesk Installation Logs:

/tmp/autoinstaller3.log

Plesk Upgrade Logs including other applications:

/tmp/psa-<app-name>...log

Plesk Access and Error Logs:

/usr/local/psa/admin/logs/httpsd_access_log 

/var/log/sw-cp-server/error_log

Plesk Migration Logs:

/usr/local/psa/PMM/logs/migration.log

WatchDog Logs on Plesk:

/usr/local/psa/var/modules/watchdog/log/monit.log

Apache Web Server Logs on Plesk:

/var/log/httpd/access_log 

/var/log/httpd/error_log

Apache Suexec Logs on Plesk:

/var/log/httpd/suexec_log

Access and Error Logs of a Website (account):

/var/www/vhosts/domain.tld/statistics/logs/access_log 

/var/www/vhosts/domain.tld/statistics/logs/error_log

Mysql Logs on Plesk:

/var/lib/mysql/server.hostname.err  (unless defined in /etc/my.cnf)

Named (Bind) Logs on Plesk:

/var/log/messages

Mail (Qmail and Postfix) Logs on Plesk:

/usr/local/psa/var/log/maillog

Ftp Logs on Plesk:

/var/log/messages

Server Logs on Plesk:

/var/log/messages

Horde Logs:

/var/log/psa-horde/psa-horde.log

Cronjob Logs:

/var/log/cron

SSH Logs:

/var/log/secure

Mailman Logs:

/var/log/mailman/

Tomcat Logs:

/var/log/tomcat5/catalina.out