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Failed to connect to mir: failed to connect to server socket: no such file or directory

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Problem :

I am trying to develop some selenium tests which should run with headless firefox but the following error suddenly popped up in my server.log file when I was trying to connect to the webdriver via following command:

driver = webdriver.Firefox(firefox_profile = profile, log_path = logfile)

Please find below the error:

1518520162032   geckodriver::marionette INFO    Starting browser /usr/bin/firefox with args ["-marionette"]

Failed to connect to Mir: Failed to connect to server socket: No such file or directory

Unable to init server: Could not connect: Connection refused

Error: cannot open display: :1137

I have not done any changes in my code. It was working fine before this error came. How can I fix the above error???

My software spec as below:

python 2.7.12, Firefox: Mozilla Firefox 57.0.3, geckodriver: 0.19.1, selenium: 3.8.0

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1 Answer

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Solution :

Your error is giving all required information:

Failed to connect to Mir: Failed to connect to server socket: No such file or directory

Unable to init server: Could not connect: Connection refused

Error: cannot open display: :1137

This error indicates that your DISPLAY property was not set properly.

Please add the below configuration in the .bashrc :

export DISPLAY=:0

For the Gnome on Ubuntu 16.04, the correct value should be DISPLAY=:1 (and not DISPLAY=:0)

The problem must be happening due to env_keep variable from /etc/sudoers. So the permanent solution should be adding the below line at the end of  /etc/sudoers by using gedit or using sudo visudo as follows:

Defaults env_keep+="DISPLAY"

 After above changes your issue will be resolved.

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