I have this:

connectionString='mongodb+srv://user:pw@something.jghu.mongodb.net/?retryWrites=true&w=majority&appName=dbricks&tls=true'
database='dealflow'
collection='activities'

frame = spark.read.format("mongodb") \
    .option("spark.mongodb.read.connection.uri", connectionString) \
    .option("spark.mongodb.read.database", database) \
    .option("spark.mongodb.read.collection", collection) \
    .option("spark.mongodb.read.readPreference.name", "primaryPreferred") \
    .load()

display(frame)

that times out.

When I telnet I get a "server lookup failure". This only happens on Databricks.