Till yeaterday i.e. 17th July 2018 I was able to successfully run my testcases. But now I'm getting below error:

A exception with a null response was thrown sending an HTTP request to the remote WebDriver.

server URL.

The status of the exception was ConnectFailure, and the  
message was: Unable to connect to the remote server"

Before this error:

I was getting "Selenium with C# giving exception Only one usage of each socket address (protocol/network address/port) is normally permitted" exception.

I've updated WebDriver and WebDriver Support DLLs.

Can you please help on this.

  • 1
    Your browser got updated, please use the correct browser driver. Specify which browser and driver version are you using Commented Jul 17, 2018 at 6:49
  • @zishanpaya After switching to previous version of Webdriver problem got resolved. Thanks for your help.
    – V. P.
    Commented Jul 18, 2018 at 5:56
  • Please accept the answer Commented Sep 5, 2018 at 5:00

1 Answer 1


This issue is due to Browser updates, Please use the updated driver or downgrade the browser to older version.

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