Warning: mysqli::real_connect(): Error while reading greeting packet. PID=29 in /var/www/html/db.php on line 11

Fatal error: Uncaught mysqli_sql_exception: MySQL server has gone away in /var/www/html/db.php:11 Stack trace: #0 /var/www/html/db.php(11): mysqli->real_connect('caboose.proxy.r...', 'root', Object(SensitiveParameterValue), 'railway', 15095) #1 /var/www/html/index.php(5): include('/var/www/html/d...') #2 {main} thrown in /var/www/html/db.php on line 11