Fallo al conectar a MySQL: (2002) Connection refusedError cargando el conjunto de caracteres utf8: 
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<b>Warning</b>:  mysqli::query(): Couldn't fetch mysqli in <b>/var/www/simuladormosaicos.cerlat.com/index.php</b> on line <b>73</b><br />
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<b>Fatal error</b>:  Uncaught Error: Call to a member function fetch_row() on null in /var/www/simuladormosaicos.cerlat.com/index.php:74
Stack trace:
#0 {main}
  thrown in <b>/var/www/simuladormosaicos.cerlat.com/index.php</b> on line <b>74</b><br />