unable to connect to chromedriver http://127.0.0.1:46050 (Selenium::WebDriver::Error::WebDriverError)
Please provide more details. How does this question relate to Jenkins? Is Jenkins executing the tests? The tests work when you run them but not when Jenkins runs them? You do not go so far as to say that out loud, but I will assume it because it is what people usually need help with.
Did you read https://wiki.jenkins-ci.org/display/JENKINS/My+software+builds+on+my+computer+but+not+on+Jenkins ?
If you are executing Chrome inside a Jenkins job, do you have something like https://wiki.jenkins-ci.org/display/JENKINS/Xvfb+Plugin or https://wiki.jenkins-ci.org/display/JENKINS/Xvnc+Plugin installed?
chromedriver can be installed in two ways: downloading, decompressing the zip and putting the file in "/usr/bin" or adding the "chromedriver-helper" gem in your Gemfile.
Choose one or another way because doing both many time it causes problems. If you are installing chromedriver from google, be sure to uninstall the gem:
gem uninstall chromedriver-helper and be sure chromedriver is in your path:
which chromedriver