Warning: mysqli::mysqli(): (HY000/2002): Connection refused in /var/www/matis/data/www/matis.zp.ua/init/model/DbMysqli.Class.php on line 17

Warning: mysqli::set_charset(): Couldn't fetch DbMysqli in /var/www/matis/data/www/matis.zp.ua/init/model/DbMysqli.Class.php on line 18

Ошибка в работе сайта

/
Warning: Unknown: open(/var/www/matis/data/mod-tmp/sess_478qb1bh530et60hulih9jbsj3, O_RDWR) failed: Read-only file system (30) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/www/matis/data/mod-tmp) in Unknown on line 0