Firefox driver is not getting launch on VM machine - selenium

Question

1. resources I used : C# , Selenium , VS 2017, Jenkins , VM machine (windows 10) , Nunit v3.9, geckoDrive v19, firefox v56/57
2. I can execute firefox / chrome browser cases on local machine
3. I can execute chrome browser cases on VM machine
4. Issue : **I can Not execute firefox cases on VM machine and its throwing below error.**
**Error Message**
OpenQA.Selenium.WebDriverException : Cannot start the driver service on http://localhost:50352/
TearDown : System.NullReferenceException : Object reference not set to an instance of an object.
I am adding few code below where issue is throwing issue
Stacktrace
at OpenQA.Selenium.DriverService.Start()
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.Firefox.FirefoxDriver..ctor(String geckoDriverDirectory, FirefoxOptions options, TimeSpan commandTimeout)
at MPAutomation.Driver.Initialize(String browser) in D:\Workspace.Automation\MPproject\MPAutomation\Utility\Driver.cs:line 79
# code on this line : Instance = new FirefoxDriver(service.FirefoxBinaryPath, options, TimeSpan.FromSeconds(10));
at MPAutomation.BaseTest.Init() in D:\Workspace.Automation\MPproject\MPAutomation\Utils\BaseTest.cs:line 54
#code here : LoginPage.GoTo(Settings.BrowserType); # I am passing "Firefox"
--TearDown
at MPAutomation.Driver.Close() in D:\Workspace.Automation\MPproject\MPAutomation\Utility\Driver.cs:line 117
# Instance.Close();
at MPAutomation.BaseTest.Cleanup() in D:\Workspace.Automation\MPproject\MPAutomation\Utils\BaseTest.cs:line 97
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firefox implemnetation looks like this in Driver.cs
- I tried with various version of Firefox too but none is working on VM
else if(browser.Equals(Constant.Firefox)) {
// driver init from here
FirefoxDriverService service = FirefoxDriverService.CreateDefaultService(DrivePath);
service.FirefoxBinaryPath = DrivePath;
var profile = new FirefoxProfile();
profile.AcceptUntrustedCertificates = true;
var options = new FirefoxOptions();
options.AcceptInsecureCertificates = true;
options.Profile = profile;
Instance = new FirefoxDriver(service.FirefoxBinaryPath, options, TimeSpan.FromSeconds(10));
Instance.Manage().Timeouts().ImplicitWait = TimeSpan.FromSeconds(10);
Utility.Logger.Write("***** Firefox Browser has been initialized now *********");
}
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5. We have one certificate for firefox and which has already been taken care locally and on VM
6. I am not sure why automation is not able to start firefox on VM

Answer 1

Finally we got the solution of this issue.
We need to set up "sandbox level" for firefox on VM.
profile.setPreference("security.sandbox.content.level", 5);
https://github.com/mozilla/geckodriver/issues/466
https://wiki.mozilla.org/Security/Sandbox