Unable to connect with mongo db

I am deploying on of my meteor app using galaxy hosting in US-EAST-1 region. I have my mongo db on atlas. I am able to connect with the mongo db from studio-3T. but I am getting the error
2019-04-08 20:02:49+05:30MongoError: failed to connect to server [healthymummy-production-us-shard-00-02-zvk0h.mongodb.net:27017] on first connect [MongoError: connection 5 to healthymummy-production-us-shard-00-02-zvk0h.mongodb.net:27017 timed out].

Please let me know how can I resolve this?