How to fix selenium "DevToolsActivePort file doesn't exist" exception in Python

Question

When I use both arguments --headless and user-data-dir. Selenium raise selenium.common.exceptions.WebDriverException: Message: unknown error: DevToolsActivePort file doesn't exist exception. If only 1 of them is used, then everything works as needs.

I tried to swap arguments and remove some of them. Specified the full path to chromedriver.exe. None of this helped.

chromeOptions.add_argument("--disable-dev-shm-using") DIDN'T HELP ME.

login = "test"
chromeOptions = webdriver.ChromeOptions() 
chromeOptions.add_experimental_option("prefs", {"profile.managed_default_content_settings.images": 2}) 
chromeOptions.add_argument("--no-sandbox") 
chromeOptions.add_argument("--disable-setuid-sandbox") 
chromeOptions.add_argument("--disable-dev-shm-using") 
chromeOptions.add_argument("--disable-extensions") 
chromeOptions.add_argument("--disable-gpu") 
chromeOptions.add_argument("start-maximized") 
chromeOptions.add_argument("disable-infobars") 
chromeOptions.add_argument("--headless") 
chromeOptions.add_argument(r"user-data-dir=.\cookies\\" + login) 
b = webdriver.Chrome(chrome_options=chromeOptions) 
b.get("https://google.com/") 
b.quit()

vffuunnyy · Accepted Answer · 2021-02-04T10:30:57.150

97

I solve it by adding an argument --remote-debugging-port=<port>

chromeOptions = webdriver.ChromeOptions() 
chromeOptions.add_experimental_option("prefs", {"profile.managed_default_content_settings.images": 2}) 
chromeOptions.add_argument("--no-sandbox") 
chromeOptions.add_argument("--disable-setuid-sandbox") 

chromeOptions.add_argument("--remote-debugging-port=9222")  # this

chromeOptions.add_argument("--disable-dev-shm-using") 
chromeOptions.add_argument("--disable-extensions") 
chromeOptions.add_argument("--disable-gpu") 
chromeOptions.add_argument("start-maximized") 
chromeOptions.add_argument("disable-infobars")
chromeOptions.add_argument(r"user-data-dir=.\cookies\\test") 

b = webdriver.Chrome(chrome_options=chromeOptions) 
b.get("https://google.com/") 
b.quit()

edited Feb 04 '21 at 10:30

answered Jun 17 '19 at 19:57

vffuunnyy

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Could you explain why this fixes it ? – mosaad Feb 03 '21 at 16:38
1

@mosaad so, I have forgotten everything, but I think this fixes it because chrome can't connect to debug and you need to make it manual. – vffuunnyy Feb 04 '21 at 10:34
2

Could you please say where this code has been added? What is the name of the file? – dwilli Apr 16 '21 at 15:57
1

maybe port was taken – lava Feb 15 '22 at 12:47
1

If nothing works, try to restart your PC. Worked for me. – Tomasz Decker Nov 14 '22 at 11:48
Hi @vffuunnyy, I'm running scripts through Organization host machine, Every Single time it triggers through Unique port. Could you please tell how to pass unique ports in this case? – Aman Khan Jul 24 '23 at 04:44

How to fix selenium "DevToolsActivePort file doesn't exist" exception in Python

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