Hi there,

I have been fighting all day trying to connect to a MongoDB server in the Cloud (MongoDB Atlas) with no success so far.

MongoDB Atlas enforces SSL to connect to their servers and here is the issue as I am getting “failed to connect: ** (Mongo.Error) ssl connect: TLS Alert: handshake failure - {:tls_alert, ‘handshake failure’}”.

I can connect with no issue using the mongo-shell with the “–ssl” option so the connectivity is ok. When I check the logs on the server side I am getting “SSL: error:1408A0C1:SSL routines:ssl3_get_client_hello:no shared cipher”. I checked with openssl and the expected cipher is AES256-GCM-SHA384.

After looking for a solution online I saw that there was a few issue with Elixir and SSL connectivity. I tried to play with ssl_opts using something like :

Mongo.start_link(
database: "admin", 
hostname: "cluster-name.mongodb.net:27017",
ssl: true,
ssl_opts: [
  ciphers: ["{:aes_256_gcm, :sha384}"], #also tried with ["AES256-GCM-SHA384"]
  versions: [:"tlsv1.2"]
]
)

I had no success so far and I am not sure where to dig as I am not familiar with Elixir. Any help would be kindly appreciated.

Cheers,
Norman