Chrome Driver Error using Selenium: Unable to Discover Open Pages
Solution 1:
You are using a highly outdated version of the ChromeDriver. Your first port of call should be to update it here.
I would highly suspect the problem is your Chrome on your server has updated, and ChromeDriver v2.1 doesn't support any recent versions of Chrome.
Solution 2:
Look here for other possible solutions: https://groups.google.com/forum/?hl=en#!topic/selenium-users/gfvfH-YEC48
In my case, adding the --no-sandbox argument to ChromeOptions solved the problem.
Solution 3:
Here's a quick workaround I found while digging around to get rid of that error: unknown error: unable to discover open pages
In your protractor config file, add the following:
capabilities: {
browserName: 'chrome',
chromeOptions: {
args: ['--no-sandbox']
}
},
The most important line there is the --no-sandbox; adding that line somehow gets rid of that error.
I am not exactly sure why it works but it's a workaround I found while digging around online.
***********************************UPDATES as of 10/04/2016***********************************
Please ignore this part right above as that workaround is NOT a proper fix; below I show you the actual fix to your problem; you just have an outdated chrome driver and running "webdriver-manager update" will only update up to v2.22 so I'll show you how to grab v2.24 right below.
Read on if your webdriver-manager update doesn't update chromedriver to the latest i.e past v2.22 OR to v2.24 as of 10/04/2016.
I lost a few weeks pulling my hair around an issue I had with "Unable to discover open pages"
and every time I would update the chromedriver, it would update to version 2.22
for chromedriver and I believe the selenium server to v2.53
.
My problem wasn't really with the selenium server so v2.53 was fine.
Issue was with chromedriver v2.22.
Eventhough this chromdriver link showed that there was a latest version of 2.24, 'webdriver-manager update'
would NOT pick up that latest version, it would only grab version 2.22 of the chrome driver.
How did I go around this?
Simply run the command below after you check this link for which version of chromedriver you want to update to; for instance, I wanted v2.24 so I ran the command below:
webdriver-manager update --versions.chrome 2.24
If you check your location: C:\Users\<USER>\AppData\Roaming\npm\node_modules\webdriver-manager\selenium\
You should see that the desired chromedriver was downloaded there; if it's not there, read the command prompt logs and it'll tell you where it downloaded your chromdriver files.
Hope that helps someone!
Solution 4:
I had the same problem, but updating to the latest ChromeDriver (v2.8) did not solve it for me. I was running Selenium on a CI server (A Dell machine running 64 bit Win 7). I got the exception every time when the server had been 'idle' for a while.
What fixed the problem for me was to set 'Turn off display after' in Windows' Power Options to 'Never'.
Solution 5:
I am running selenium with python in Docker on a Google compute instance. For me, the issue was that my instance didn't have enough memory, and my scrape job would fail with this error. Upgrading it to g1-small resolved the issue for me.