org.openqa.selenium.firefox.NotConnectedException: Unable to connect to host 127.0.0.1 on port 7055 after

solution : get new webdriver libraries here then will be resolved

Webdriver - System Properties

   
















webdriver usage:

           System.setProperty("webdriver.chrome.driver", "D:\\chromedriver_win32_2.3\\chromedriver.exe");  
           WebDriver driver = new ChromeDriver();  
           driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);  
           driver.get("http://www.google.com");  

Chrome Certificate Problem --ignore-certificate-errors

 DesiredCapabilities capabilities = DesiredCapabilities.chrome();  
                  capabilities.setCapability("chrome.switches", Arrays.asList("--incognito"));  
                  ChromeOptions options = new ChromeOptions();  
                  options.addArguments("--test-type");  
                  capabilities.setCapability("chrome.binary", "C://webdrivers//chromedriver//chromedriver.exe");  
                  capabilities.setCapability(ChromeOptions.CAPABILITY, options);  
                  driver = new ChromeDriver(capabilities);  

This code fix your problem

Have nice day