If the problem is that the locator is incorrect, try using a different locator (by Id, Name, Xpath etc) and make sure that the locator corresponds to a single element on the page. This can happen when you are using an incorrect locator for your element, or when the element has not been yet loaded on the page. : no such element: Unable to locate element: System.InvalidOperationException : unknown error: Chrome version must be… In this example I teach you how to downgrade Firefox. This might be Firefox, ChromeDriver, IEDriver and so on. The Solutionĭowngrade your appropriate browser to the version supported by the latest Selenium Driver. Now, you will spend the next day wondering how your Selenium code used to work yesterday and today it just stopped working. At this point, you will receive an ugly error that looks like this: Therefore, when you get the latest version of your browser, you may be using a Selenium WebDriver version that does not support the latest features of that browser. In our industry, this is known as a regression. When different types of browsers such as Chrome or Firefox get updated, there is a chance that this update will break the Selenium API. Therefore, the Selenium WebDriver API does not get updated as often as Chrome or Firefox. The latest Chrome version is 51.0 and the latest Firefox version is 46.0. As I am writing about this, the latest WebDriver version is 2.53.1. The problem is a standard compatibility issue between Selenium WebDriver and your version of a browser. Today is your lucky day because I am going to help you resolve these really annoying errors! The Problem : Unable to connect to the remote server -> : No connection could be made because the target machine actively refused it Attempted to connect to the following addresses: 127.0.0.1:7055. > : Failed to start up socket within 45000 ms. System.TypeInitializationException: System.TypeInitializationException: The type initializer for ‘Framework.Browser’ threw an exception. However, if you receive this error, just upgrade your browser until it fits into the support matrix of ChromeDriver release logs. Keep in mind that maybe your versions of browser and ChromeDriver may be different. Update your Chrome browser to version 57.0.Until then, we will keep having these issues. This will probably continue until Selenium WebDriver is a W3C standard that is integrated into each browser. This the largest burden in many of my behind, and has been for years now. You may have noticed that this page has one trend. Compatibility of Selenium WebDriver with a browser. Selenium.WebDriverException: ‘A exception with a null response was thrown sending an HTTP request to the remote WebDriver server for URL The status of the exception was ReceiveFailure, and the message was: The underlying connection was closed: An unexpected error occurred on a receive.’ InnerException Similar to the error above, but it’s slightly different in wording and message. How to fix common Selenium errors? Click To TweetĪn exception with a null response was thrown sending an HTTP request to the remote… If this doesn’t work, restart your computer and try again.Warning: It’s almost impossible to downgrade ChromeDriver, so don’t tryĭownload the latest Selenium WebDriver API Nuget package Rebuild your whole solution with all of these new resources Try to run your tests again. Upgrade your Chrome and your ChromeDriver if you must How to tell if ChromeDriver is compatible with Chrome Browser You can see this information on the ChromeDriver download page.Make sure that your Chrome Browser and your ChromeDriver version are compatible.Until I tell you it’s okay to use other Drivers. Use ChromeDriver for all your test automation practice.This is the largest burden in my behind, and has been for years now… Unable to connect to the remote server The ProblemĬompatibility of Selenium WebDriver with a browser is the culprit here. A exception with a null response was thrown sending an HTTP request to the remote WebDriver server for URL The status of the exception was ConnectFailure, and the message was: Unable to connect to the remote server InnerException
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