Error: No suitable servers found (`serverSelectionTryOnce` set): [socket timeout calling ismaster on ...]

Question

I am wondering why shinyapps.io no longer can connect to a mongoDB from Atlas. I have done countless projects using mongoAtlas and shinyapps.io.

As of today, any new app I publish does not allow me to connect to my mongoDB.

In my logs I get an error: No suitable servers found (serverSelectionTryOnce set): [socket timeout calling ismaster on 'cluster0-shard-00-00-02dsl.mongodb.net:27017']

The code runs perfectly on Rstudio Cloud, my local pc and my friends local pc. But shinyapps.io is having a hard time.

UI.R

library(mongolite)
shinyUI(fluidPage(

    # Application title
    titlePanel("Old Faithful Geyser Data"),

    # Sidebar with a slider input for number of bins
    sidebarLayout(
        sidebarPanel(
            sliderInput("bins",
                        "Number of bins:",
                        min = 1,
                        max = 50,
                        value = 30)
        ),

        # Show a plot of the generated distribution
        mainPanel(
            tableOutput("table")
        )
    )
))

Server.R

library(shiny)

# Define server logic required to draw a histogram
shinyServer(function(input, output) {
    url = "mongodb://jwrong:<mypass>@cluster0-shard-00-00-02dsl.mongodb.net:27017,cluster0-shard-00-01-02dsl.mongodb.net:27017,cluster0-shard-00-02-02dsl.mongodb.net:27017/test?ssl=true&replicaSet=Cluster0-shard-0&authSource=admin&retryWrites=false"
    df.orats = mongo(collection = "df.orats", db = "test", url = url, verbose = T)



    d = df.orats$find()

    output$table <- renderTable({
        d
    })

})

Answer 1

You can try now. Probably, there was some issue with MongoDB or shinyapps.io. Rather the second one. Now everything works.