Verbindung zu Pool-DB 2021 fehlgeschlagen: SQLSTATE[HY000] [2006] MySQL server has gone away

Fatal error: Uncaught Error: Call to a member function prepare() on null in D:\www\www47\php_cfg\cfg.php:365
Stack trace:
#0 D:\www\www47\index.php(17): require()
#1 {main}
  thrown in D:\www\www47\php_cfg\cfg.php on line 365