Hi, Sometimes I receive this kind of errors from the sql server, is an ispconfig3 devian os with nginx. Anyone know what can be? Best regards. OSSEC HIDS Notification. 2014 Nov 02 00:32:37 Received From: ->/var/log/syslog Rule: 1002 fired (level 2) -> "Unknown problem somewhere in the system." Portion of the log(s): Nov *2 00:32:36 mysqld: 141102 *0:32:36 [ERROR] /usr/sbin/mysqld: Can't open file: './c0mydb/u60eb_messages.frm' (errno: 24) --END OF NOTIFICATION OSSEC HIDS Notification. 2014 Nov 02 00:32:37 Received From: ->/var/log/syslog Rule: 1002 fired (level 2) -> "Unknown problem somewhere in the system." Portion of the log(s): Nov *2 00:32:37 mysqld: 141102 *0:32:37 [ERROR] /usr/sbin/mysqld: Can't open file: './c1mydb/j25_finder_filters.frm' (errno: 24)