Unable to connect remotely (non-localhost) : aka library ignores URI hostname

[blackham]

I am having difficultly connecting to MongoDB remotely. It appears it is trying to connect to localhost regardless of what the hostname or URI/URL is set to.

I am able to connect to MongoDB from Compass (GUI) using the URL mongodb://10.192.10.70:27017/?directConnection=true
I am able to connect to MongoDB using elixir-mongo/mongodb if I run elixir on the the same server as mongo (localhost) using: {:ok, conn} = Mongo.start_link(url: "mongodb://localhost:27017/parties"}

However, from a remote computer the following command produces an error.

{:ok, conn} = Mongo.start_link(url: "mongodb://10.192.10.70:27017/parties?directConnection=true")
{:ok, #PID<0.574.0>}
[error] Mongo.Protocol (#PID<0.588.0>) failed to connect: ** (Mongo.Error) localhost:27017 tcp connect: connection refused - :econnrefused

I tried the following, all with the same error about (Mongo.Error) localhost:27017 tcp connect: connection refused

{:ok, conn} = Mongo.start_link(url: "mongodb://10.192.10.70:27017/?replicaSet=rs0&tls=false&directConnection=true")
{:ok, pid} = Mongo.start_link(database: "parties", seeds: ["10.192.10.70:27017"])
{:ok, conn} = Mongo.start_link(url: "mongodb://10.192.10.70:27017/parties?directConnection=true", hostname: "10.192.10.70")
{:ok, conn} = Mongo.start_link(url: "mongodb://10.192.10.70:27017/parties", hostname: "10.192.10.70")
{:ok, conn} = Mongo.start_link(url: "mongodb://10.192.10.70:27017/parties")

I did toss some debug code into Mongo.Protocol.Utils and Mongo.UrlParser which shows it has the correct URL

[
...
seeds: ["10.192.10.70:27017"],
hostname: "10.192.10.70",
port: 27017
]
[
pool_index: 1,
topology_pid: #PID<0.574.0>,
connection_type: :client,
database: "parties",
seeds: ["10.192.10.70:27017"],
hostname: "10.192.10.70",
port: 27017
]

But the inspect output of opts from Mongo.Protocol shows tcp_connect has the following opts:

[
pool_index: 1,
pool_size: 1,
topology_pid: #PID<0.5876.0>,
connection_type: :monitor,
backoff_type: :rand,
backoff_max: 10000,
backoff_min: 10000,
after_connect: {Mongo.Monitor, :connected, [#PID<0.5887.0>, #PID<0.5876.0>]},
skip_auth: true,
database: "admin",
pool: DBConnection.ConnectionPool,
seeds: ["10.192.10.70:27017"],
hostname: "localhost",
port: 27017
]

Note hostname is now "localhost" oops.