Why does Nightwatch / Selenium give me a 'Connection reset' error?

问题

I'm using Ubuntu Linux, Selenium 2.53, Nightwatch.js 0.9.

When running my test with the given nightwatch.json I get a 'connection reset' error from Selenium, even though Selenium says it starts successfully. What am I doing wrong?

来源：https://stackoverflow.com/questions/38657508/why-does-nightwatch-selenium-give-me-a-connection-reset-error