I am trying to port some Selenium-Tests that I developed under windows (my main platform) to Linux (Ubuntu 19.10 in a VM). I must admit, I'm not too familiar with the environment, so I might be missing very obvious things - well, obvious for those that live on Linux ;)

After fixing issues with file permissions for the driver etc., I am stopped with this exception:

OpenQA.Selenium.WebDriverException: An unknown exception was encountered sending an HTTP request to the remote WebDriver server for URL http://localhost:39213/session. The exception message was: Connection refused
 ---> System.Net.Http.HttpRequestException: Connection refused
 ---> System.Net.Sockets.SocketException (111): Connection refused
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean allowHttp2, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts)
   at OpenQA.Selenium.Remote.HttpCommandExecutor.MakeHttpRequest(HttpRequestInfo requestInfo)
   at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute)
   --- End of inner exception stack trace ---
   at OpenQA.Selenium.Remote.HttpCommandExecutor.Execute(Command commandToExecute)
   at OpenQA.Selenium.Remote.DriverServiceCommandExecutor.Execute(Command commandToExecute)
   at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.Remote.RemoteWebDriver.StartSession(ICapabilities desiredCapabilities)
   at OpenQA.Selenium.Remote.RemoteWebDriver..ctor(ICommandExecutor commandExecutor, ICapabilities desiredCapabilities)
   at OpenQA.Selenium.Chromium.ChromiumDriver..ctor(ChromiumDriverService service, ChromiumOptions options, TimeSpan commandTimeout)
   at OpenQA.Selenium.Chrome.ChromeDriver..ctor(ChromeDriverService service, ChromeOptions options, TimeSpan commandTimeout)
   at OpenQA.Selenium.Chrome.ChromeDriver..ctor(ChromeDriverService service, ChromeOptions options)

when trying to instantiate ChromeDriver (by passing an instance of ChromeDriverService and some ChromeOptions.

How can I diagnose/fix this?

The webserver I would like to talk to listens on and delivers content to a regular browser. A coworker recommended to try netstat -an | grep 39213 to see if anything is actually listing on that port - which was not the case (no output from that command). And indeed - the service did not launch. I have an instance of ChromeDriverService - but there is no process associated with it. Will look into that now and update the question if I find anything useful...

  • What's the actual IP addr of localhost? And of your WebDriver server? Are they the same? Isn't onesth like and the other one
    – pavelsaman
    Jun 16, 2020 at 13:29
  • In which machine your WebDriver server is running? Whether in local machine or else in some other remote machine Jun 16, 2020 at 13:31
  • What is your linux distro?
    – Alexey R.
    Jun 16, 2020 at 13:49
  • Have you started selenium server before running your script ?
    – PDHide
    Jun 16, 2020 at 18:09
  • Answered 1 (partially) and 2+3 by adding to the question. Not sure what you guys mean with "Selenium Server". The "pattern" I learned on windows is to first create a ChromeDriverService and then pass that instance to the ChromeDriver. And it's all happening on this machine - no external calls needed.
    – MBaas
    Jun 17, 2020 at 7:14

1 Answer 1


Argh - found it: the file chromedriver. did not have execute-permissions. That wasn't reported as a problem when I instantiated ChromeDriverService - but I also did not create a "regular instance" of it. After setting these permissions, it's running now!

  • Could you pleas take a look at stackoverflow.com/questions/73020234/… . I have this problem with Docker
    – Sasan
    Jul 20, 2022 at 4:13
  • 1
    I had a look - but my feeling is that the issue there is something else, probably more with Docker - which I'm still learning about...
    – MBaas
    Jul 21, 2022 at 8:13

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