org.openqa.selenium.firefox.NotConnectedException: Unable to connect to host 127.0.0.1 while executing code using GeckoDriver and Firefox

问题

Code Trials :

public class loginmethod { 

    @Test 
    public void login() throws InterruptedException { 
        System.setProperty("webdriver.gecko.driver", "D:\\Tools\\geckodriver"); 
        WebDriver driver = new FirefoxDriver(); 
        driver.manage().window().maximize(); 
        driver.manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS);
    }
}

Binary Version Details :

FireFox : 60.0
Selenium Jar : 2.45
GeckoDriver : 20.1

When I run code using Firefox driver following error is given:

org.openqa.selenium.firefox.NotConnectedException: Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output:
 Potential driver version mismatch ignored due to missing DLLs igd10umd64 v= and igd10iumd64 v=
*** Blocklist::_preloadBlocklistFile: blocklist is disabled
1526302485156   addons.xpi-utils    DEBUG   Starting async load of XPI database 
1526302485236   addons.xpi  DEBUG   Ignoring file entry whose name is not a valid add-on QA\AppData\Local\Temp\anonymous5274473150250365422webdriver-profile\extensions\webdriver-staging
1526302485236   addons.xpi  DEBUG   Existing add-on fxdriver@googlecode.com in app-profile
1526302485236   addons.xpi  INFO    Mapping activity-stream@mozilla.org to C:\Program Files\Mozilla Firefox\browser\features\activity-stream@mozilla.org.xpi
1526302485236   addons.xpi  INFO    Mapping aushelper@mozilla.org to C:\Program Files\Mozilla Firefox\browser\features\aushelper@mozilla.org.xpi
1526302485236   addons.xpi  INFO    Mapping firefox@getpocket.com to C:\Program Files\Mozilla Firefox\browser\features\firefox@getpocket.com.xpi
1526302485236   addons.xpi  INFO    Mapping followonsearch@mozilla.com to C:\Program Files\Mozilla Firefox\browser\features\followonsearch@mozilla.com.xpi
1526302485236   addons.xpi  INFO    Mapping formautofill@mozilla.org to C:\Program Files\Mozilla Firefox\browser\features\formautofill@mozilla.org.xpi
1526302485236   addons.xpi  INFO    Mapping onboarding@mozilla.org to C:\Program Files\Mozilla Firefox\browser\features\onboarding@mozilla.org.xpi
1526302485236   addons.xpi  INFO    Mapping screenshots@mozilla.org to C:\Program Files\Mozilla Firefox\browser\features\screenshots@mozilla.org.xpi
1526302485236   addons.xpi  INFO    Mapping shield-recipe-client@mozilla.org to C:\Program Files\Mozilla Firefox\browser\features\shield-recipe-client@mozilla.org.xpi
1526302485236   addons.xpi  INFO    Mapping webcompat@mozilla.org to C:\Program Files\Mozilla Firefox\browser\features\webcompat@mozilla.org.xpi
1526302485236   addons.xpi  DEBUG   Existing add-on activity-stream@mozilla.org in app-system-defaults
1526302485236   addons.xpi  DEBUG   Existing add-on aushelper@mozilla.org in app-system-defaults
1526302485236   addons.xpi  DEBUG   Existing add-on firefox@getpocket.com in app-system-defaults
1526302485236   addons.xpi  DEBUG   Existing add-on followonsearch@mozilla.com in app-system-defaults
1526302485236   addons.xpi  DEBUG   Existing add-on formautofill@mozilla.org in app-system-defaults
1526302485238   addons.xpi  DEBUG   Existing add-on onboarding@mozilla.org in app-system-defaults
1526302485238   addons.xpi  DEBUG   Existing add-on screenshots@mozilla.org in app-system-defaults
1526302485238   addons.xpi  DEBUG   Existing add-on shield-recipe-client@mozilla.org in app-system-defaults
1526302485238   addons.xpi  DEBUG   Existing add-on webcompat@mozilla.org in app-system-defaults
1526302485238   addons.xpi  INFO    Mapping {972ce4c6-7e08-4474-a285-3208198ce6fd} to C:\Program Files\Mozilla Firefox\browser\extensions\{972ce4c6-7e08-4474-a285-3208198ce6fd}.xpi
1526302485238   addons.xpi  DEBUG   Existing add-on {972ce4c6-7e08-4474-a285-3208198ce6fd} in app-global
1526302485238   addons.xpi  DEBUG   getInstallState changed: false, state: {}
1526302485332   addons.xpi-utils    DEBUG   Async JSON file read took 0 MS
1526302485332   addons.xpi-utils    DEBUG   Finished async read of XPI database, parsing...
1526302485336   addons.xpi-utils    DEBUG   Successfully read XPI database
Crash Annotation GraphicsCriticalError: |[C0][GFX1]: Potential driver version mismatch ignored due to missing DLLs igd10umd64 v= and igd10iumd64 v= (t=6.22361) [GFX1]: Potential driver version mismatch ignored due to missing DLLs igd10umd64 v= and igd10iumd64 v=
Crash Annotation GraphicsCriticalError: |[C0][GFX1]: Potential driver version mismatch ignored due to missing DLLs igd10umd64 v= and igd10iumd64 v= (t=2.67818) [GFX1]: Potential driver version mismatch ignored due to missing DLLs igd10umd64 v= and igd10iumd64 v=

回答1:

This error message...

org.openqa.selenium.firefox.NotConnectedException: Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output:
 Potential driver version mismatch ignored due to missing DLLs igd10umd64 v= and igd10iumd64 v=
*** Blocklist::_preloadBlocklistFile: blocklist is disabled

...implies that the GeckoDriver was unable to initiate/spawn a new Web Client session/instance successfully.

Your main issue is the version compatibility between the binaries you are using as follows :

Your Selenium Client version is 2.45 which is almost 2.5 years older.
Your GeckoDriver version is v20.1.
Release Notes of 0.19.0 (2017-09-16) clearly mentions the following :

Note that with geckodriver 0.19.0 the following versions are recommended:

Firefox 55.0 (and greater)

Selenium 3.5 (and greater)

Release Notes of 0.16.0 (2017-04-21) clearly mentions the following :

Note that geckodriver v0.16.0 is only compatible with Selenium 3.4 and greater.

Your Firefox version is v60.0.

So there is a clear mismatch between Selenium Client v2.45, GeckoDriver v20.1 and Firefox v60.0.

Solution

Upgrade JDK to recent levels JDK 8u162.
Upgrade Selenium to current levels Version 3.11.0.
Upgrade GeckoDriver to GeckoDriver v0.20.1 level.
GeckoDriver is present in the specified location.
GeckoDriver is having executable permission for non-root users.
Upgrade Firefox version to Firefox v60.0 levels.
Clean your Project Workspace through your IDE and Rebuild your project with required dependencies only.
Use CCleaner tool to wipe off all the OS chores before and after the execution of your Test Suite.
If your base Web Client version is too old, then uninstall it through Revo Uninstaller and install a recent GA and released version of Web Client.
Take a System Reboot.
Execute your Test as a non-root user.
Always invoke driver.quit() within tearDown(){} method to close & destroy the WebDriver and Web Client instances gracefully.

来源：https://stackoverflow.com/questions/50331181/org-openqa-selenium-firefox-notconnectedexception-unable-to-connect-to-host-127

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