Webdriver Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms

Question

I have box where I run tests. It seems like Jenkins would ssh in and execute commands described in the specific job that's running.

Here I am trying to run my Selenium Webdriver tests, but it tells me that I have errors in launching firefox. The end idea is to run the webtests on this box entirely, and also take some screenshots of errors.

I am using selenium-java-2.25.jar, firefox 10, linux OS.

The funny thing is that I can ssh in manually into the box, temporarily copy the magic cookie from another user on the box (to get an X tunnel), do an export DISPLAY=mydisplay:1.0, then launch my selenium tests using ant. And this will bring up firefox and the tests just fine.

There are various threads here that seem to have the exact same problem, and I think I've tried most of them. Here is what I've done:

• Reboot the box, log back in with VNC.

• Placed a bash script in Jenkins to run before running selenium tests. The bash script basically just does an export DISPLAY=mydisplay:1.0. It also executes xclock. This works as I can see xclock being displayed in the VNC.

• iptables have been turned off

• firefox is correctly located in /usr/bin/firefox

• sshd_config shows having X11Forwarding as true.

• Supposedly downgrading firefox helped some people, but I do not wish to do this. Webdriver should support FF 10 anyway.

However, none of the above solves the problem.

It doesn't seem like port 7055 on localhost even exists:

netstat -an | grep 7055 - Nothing prints

This is what my /etc/hosts says:

  1 127.0.0.1               localhost.localdomain localhost
  2 ::1             localhost6.localdomain6 localhost6

Perhaps it has something to do with localhost:7055 not existing? I am unsure where to go from here. still, why does the error output say it's looking for display: :0.0 when I've specified mydisplay:1.0?

And finally the error output I receive:

[testng] org.openqa.selenium.firefox.NotConnectedException: Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output:
[testng] Xlib: connection to ":0.0" refused by server
[testng] Xlib: No protocol specified
[testng] 
[testng] Error: cannot open display: :0.0
[testng] Xlib: connection to ":0.0" refused by server
[testng] Xlib: No protocol specified
[testng] 
[testng] Xlib: connection to ":0.0" refused by server
[testng] Xlib: No protocol specified
[testng] 
[testng] Xlib: connection to ":0.0" refused by server
[testng] Xlib: No protocol specified
[testng] 
[testng] Error: cannot open display: :0.0
[testng] 
[testng]    at org.openqa.selenium.firefox.internal.NewProfileExtensionConnection.start(NewProfileExtensionConnection.java:109)
[testng]    at org.openqa.selenium.firefox.FirefoxDriver.startClient(FirefoxDriver.java:245)
[testng]    at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:109)
[testng]    at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:185)
[testng]    at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:178)
[testng]    at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:174)
[testng]    at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:92)
[testng]    at com.test.webtest.browser.BrowserFactory.createBrowser(BrowserFactory.java:24)
[testng]    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[testng]    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[testng]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[testng]    at java.lang.reflect.Method.invoke(Method.java:601)

Answer 1

Don't know if you resolved this problem, but I have just resolved the same issue from the other side.

It appears Selenium and Firefox have difficulty talking to each other - I suspect Firefox 'evolve' changes over a number of releases, so backward and forward compatibility are not always guaranteed, and incompatibility always seems to generate the same error.

My problem started when I moved from FF 15 to FF 16. Running on Ubuntu, this happens auto magically along with other upgrades but I believe this was the critical change.

The problem was resolved by moving from Selenium 2.24.1 to Selenium 2.25.0

As the selenium change is just download the jar file and run it instead of the old one,it's worth trying this as a quick and easy troubleshooter - if it doesn't help, just switch back. In your case, I'm not sure which version of Selenium to try, but I think 2.24 should work with FF 10.

Another issue I have found in the past is that Firefox would not run as root on Ubuntu. This happens if Selenium is running as a service, or possibly if it is fired up from a bash script or cron job. This may explain why it runs for you but not for Jenkins.