Fatal error: Uncaught MongoDB\Driver\Exception\ConnectionTimeoutException: No suitable servers found (`serverSelectionTryOnce` set): [connection timeout calling ismaster on 'mongodb3:27017'] [Failed to resolve 'mongodb4'] [connection refused calling ismaster on 'mongodb5:27017'] in /var/www/vendor/mongodb/mongodb/src/functions.php:431 Stack trace: #0 /var/www/vendor/mongodb/mongodb/src/functions.php(431): MongoDB\Driver\Manager->selectServer() #1 /var/www/vendor/mongodb/mongodb/src/Collection.php(684): MongoDB\select_server() #2 /var/www/public_report.php(15): MongoDB\Collection->findOne() #3 {main} thrown in /var/www/vendor/mongodb/mongodb/src/functions.php on line 431