Selenium server logs
Following way to start a selenium server, will help you answer common answers when nothing has changed (wrt software under test or script)
My Selenium test broke. This was a one-off. I did not change anything to my website or the test script. What might have gone wrong? Did the browser session die an unnatural death or was it the webdriver silently running into something unexpected?
Selenium server (over grid) jar provides an option to configure logs with following commands: java -Dselenium.LOGGER.level=INFO -log Path/to/webdriver-server.log -jar selenium-standalone.jar