ISPConfig can not create a database if the name consists only of numbers.
Debug log
2015-06-15 18:10 Debug Processed datalog_id 2797 2015-06-15 18:10 Debug GRANT ALL ON 6007.* TO '6007'@'localhost' IDENTIFIED BY PASSWORD '*password'; success? no 2015-06-15 18:10 Debug GRANT for user 6007 at host localhost 2015-06-15 18:10 Debug Unable to create the database: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '6007' at line 1 2015-06-15 18:10 Debug Calling function 'db_insert' from plugin 'mysql_clientdb_plugin' raised by event 'database_insert'. 2015-06-15 18:10 Debug Processed datalog_id 2796 2015-06-15 18:10 Debug Calling function 'db_user_update' from plugin 'mysql_clientdb_plugin' raised by event 'database_user_update'. 2015-06-15 18:10 Debug Processed datalog_id 2795 2015-06-15 18:10 Debug Error while dropping MySQL database: 6007 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '6007' at line 1 2015-06-15 18:10 Debug REVOKE for user 6007 at host localhost 2015-06-15 18:10 Debug Calling function 'db_delete' from plugin 'mysql_clientdb_plugin' raised by event 'database_delete'. 2015-06-15 18:10 Debug Found 3 changes, starting update process.