Mongo Atlas连接问题

问：

我有一个应用程序，在meteor.js中创建，但我认为它不应该重要。我在mongo atlas上也有mongo集群。到目前为止，在开发过程中，我通过连接字符串连接到数据库，没有问题地从我的本地机器。但是，当我在 DigitalOcean 上创建 linux 机器并尝试使用相同的连接字符串连接我的应用程序时mongodb+srv://<user>:<password>@xyz.mongodb.net/<dbName>?retryWrites=true&w=majority

我收到以下错误。

MongoNetworkError: failed to connect to server [xyz.mongodb.net:27017] on first connect [MongoNetworkError: connection 5 to xyz.mongodb.net:27017 closed
    at TLSSocket.<anonymous> (/home/ubuntu/staging/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/core/connection/connection.js:440:9)
    at Object.onceWrapper (events.js:421:26)
    at TLSSocket.emit (events.js:314:20)
    at TLSSocket.EventEmitter.emit (domain.js:483:12)
    at net.js:675:12
    at TCP.done (_tls_wrap.js:568:7)]
    at Pool.<anonymous> (/home/ubuntu/staging/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/core/topologies/server.js:438:11)
    at Pool.emit (events.js:314:20)
    at Pool.EventEmitter.emit (domain.js:483:12)
    at /home/ubuntu/staging/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/core/connection/pool.js:562:14
    at /home/ubuntu/staging/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/core/connection/pool.js:1009:9
    at callback (/home/ubuntu/staging/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/core/connection/connect.js:75:5)
    at /home/ubuntu/staging/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/core/connection/connect.js:101:9
    at _callback (/home/ubuntu/staging/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/core/connection/connection.js:329:7)
    at Connection.errorHandler (/home/ubuntu/staging/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/core/connection/connection.js:344:7)
    at Object.onceWrapper (events.js:421:26)
    at Connection.emit (events.js:314:20)
    at Connection.EventEmitter.emit (domain.js:483:12)
    at TLSSocket.<anonymous> (/home/ubuntu/staging/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/core/connection/connection.js:438:12)
    at Object.onceWrapper (events.js:421:26)
    at TLSSocket.emit (events.js:314:20)
    at TLSSocket.EventEmitter.emit (domain.js:483:12)

你知道我的服务器配置可能有什么问题吗？我想这是服务器配置，因为在其他机器上相同的连接字符串有效。