MongoConnectionException：找不到合适的服务器

Question

我正在尝试使用FOSUserBundle和FOSOauthServerBundle以及DoctrineMongoDBBundle来实现基于其余API令牌的身份验证， 当调用需要身份验证的路由时，我设置了配置并使用“ doctrine：mongodb：schema：create”和“ fos：user：create”创建了架构和用户，我在日志中遇到以下错误：

request.CRITICAL: Uncaught PHP Exception MongoConnectionException: "No suitable servers found (`serverSelectionTryOnce` set): [connection refused calling ismaster on 'localhost:27017']" at /var/www/html/middleware/vendor/alcaeus/mongo-php-adapter/lib/Alcaeus/MongoDbAdapter/ExceptionConverter.php line 79 {"exception":"[object] (MongoConnectionException(code: 13053): No suitable servers found (`serverSelectionTryOnce` set): [connection refused calling ismaster on 'localhost:27017'] at /var/www/html/middleware/vendor/alcaeus/mongo-php-adapter/lib/Alcaeus/MongoDbAdapter/ExceptionConverter.php:79, MongoDB\\Driver\\Exception\\ConnectionTimeoutException(code: 13053): No suitable servers found (`serverSelectionTryOnce` set): [connection refused calling ismaster on 'localhost:27017'] at /var/www/html/middleware/vendor/mongodb/mongodb/src/Collection.php:612)"} []

这是我的配置：

doctrine_mongodb:
    connections:
        default:
            server: "%mongodb_server%"
            options: { username: "%mongodb_username%", password: "%mongodb_password%" }
    default_database: "%mongodb_database%"
    document_managers:
        default:
            auto_mapping: true

fos_user:
    db_driver: mongodb
    firewall_name: api                                        
    user_class: AppBundle\Document\User
    from_email:
        address: "%mailer_user%"
        sender_name: "%mailer_user%"

 fos_oauth_server:
    db_driver:           mongodb
    client_class:        AppBundle\Document\Client
    access_token_class:  AppBundle\Document\AccessToken
    refresh_token_class: AppBundle\Document\RefreshToken
    auth_code_class:     AppBundle\Document\AuthCode
    service:
        user_provider: fos_user.user_provider.username

使用：

parameters:
    secret: ThisTokenIsNotSoSecretChangeIt
    mongodb_server: mongodb://mongodb_forms:27017
    mongodb_database: pocforms
    mongodb_username: forms
    mongodb_password: forms
    mailer_user: admin@forms

我发现奇怪的是，在日志中，该连接正尝试到达localhost：27017上的服务器，并且没有任何配置。