`cannot connect to chrome at 127.0.0.1:37541` when using undetected-chromedriver with Python

Question

After using Selenium, I decided to try undetected-chromedriver so I installed it using

 pip install undetected-chromedriver

However, running this simple script

import undetected_chromedriver.v2 as uc

options = uc.ChromeOptions()
options.add_argument('--no-sandbox')

driver = uc.Chrome(options=options)
with driver:
    driver.get('https://google.com') 

gives the error

selenium.common.exceptions.WebDriverException: Message: unknown error: cannot connect to chrome at 127.0.0.1:37541 from chrome not reachable

There's no issue using regular Selenium

from selenium import webdriver

options = webdriver.ChromeOptions()
options.add_argument('--headless')
options.add_argument("--no-sandbox"); # Bypass OS security model

driver = webdriver.Chrome(options=options)
with driver:
    driver.get('https://google.com') 

Here's the traceback

Traceback (most recent call last):
  File "/root/test-bot/src/test.py", line 6, in <module>
    driver = uc.Chrome()
  File "/root/anaconda3/envs/test/lib/python3.9/site-packages/undetected_chromedriver/v2.py", line 302, in __init__
    super(Chrome, self).__init__(
  File "/root/anaconda3/envs/test/lib/python3.9/site-packages/selenium/webdriver/chrome/webdriver.py", line 69, in __init__
    super(WebDriver, self).__init__(DesiredCapabilities.CHROME['browserName'], "goog",
  File "/root/anaconda3/envs/test/lib/python3.9/site-packages/selenium/webdriver/chromium/webdriver.py", line 93, in __init__
    RemoteWebDriver.__init__(
  File "/root/anaconda3/envs/test/lib/python3.9/site-packages/selenium/webdriver/remote/webdriver.py", line 248, in __init__
    self.start_session(capabilities, browser_profile)
  File "/root/anaconda3/envs/test/lib/python3.9/site-packages/undetected_chromedriver/v2.py", line 577, in start_session
    super(Chrome, self).start_session(capabilities, browser_profile)
  File "/root/anaconda3/envs/test/lib/python3.9/site-packages/selenium/webdriver/remote/webdriver.py", line 339, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)
  File "/root/anaconda3/envs/test/lib/python3.9/site-packages/selenium/webdriver/remote/webdriver.py", line 400, in execute
    self.error_handler.check_response(response)
  File "/root/anaconda3/envs/test/lib/python3.9/site-packages/selenium/webdriver/remote/errorhandler.py", line 236, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: unknown error: cannot connect to chrome at 127.0.0.1:52681
from chrome not reachable
  (Driver info: chromedriver=2.41.578700 (2f1ed5f9343c13f73144538f15c00b370eda6706),platform=Linux 5.11.0-18-generic x86_64)

Any suggestions?

---

Attempt #1

Also tried setting the executable_path to /usr/bin/chromedriver

import undetected_chromedriver.v2 as uc

options = uc.ChromeOptions()
options.add_argument('--no-first-run --no-service-autorun --password-store=basic')

CHROME_DRIVER_PATH = '/usr/bin/chromedriver'
driver = uc.Chrome(executable_path=CHROME_DRIVER_PATH, options=options)
with driver:
    driver.get('https://google.com') 

which gives the same error

selenium.common.exceptions.WebDriverException: Message: unknown error: cannot connect to chrome at 127.0.0.1:42305 from chrome not reachable

Checked that the path does exists

# ll /usr/bin/chromedriver
-rwxr-xr-x 1 root root 8298464 Oct  1 14:19 /usr/bin/chromedriver*

---

Attempt #2

Tried using Xvfb and disabling headless mode

import undetected_chromedriver.v2 as uc
from xvfbwrapper import Xvfb
vdisplay = Xvfb(width=800, height=1280)
vdisplay.start()

options = uc.ChromeOptions()
options.add_argument('--no-first-run --no-service-autorun --password-store=basic')
options.user_data_dir = f'./tmp/test_undetected_chromedriver'
options.add_argument(f'--disable-gpu')
options.add_argument(f'--no-sandbox')
options.add_argument(f'--disable-dev-shm-usage')

CHROME_DRIVER_PATH = '/usr/bin/chromedriver'
driver = uc.Chrome(executable_path=CHROME_DRIVER_PATH, options=options, headless=False)
with driver:
    driver.get('https://google.com') 
    print(driver.title)

slightly different error

selenium.common.exceptions.WebDriverException: Message: unknown error: cannot connect to chrome at 127.0.0.1:42467 from unknown error: unable to discover open pages (Driver info: chromedriver=2.41.578700 (2f1ed5f9343c13f73144538f15c00b370eda6706),platform=Linux 5.11.0-18-generic x86_64)

Answer 1

I got the error when creating a new driver while there was still running an existing driver.

Answer 2

I solved it through manually run chrome.exe --user-data-dir="userdata folder path".
see this github link

Answer 3

I had the exact same issue in Centos 7 and the problem was the versions of chrome, undetected-chrome and chromedriver where NOT aligned.

Solution that worked for me (I'm using Python v3.8):

1. Remove the existing versions

cd /YOUR_CHROMEDRIVER_PATH
yum remove google-chrome*
python3.8 -m pip uninstall undetected-chromedriver
rm -f chromedriver

2. Install aligned versions

python3.8 -m pip install undetected-chromedriver==3.0.6
wget -N http://chromedriver.storage.googleapis.com/96.0.4664.35/chromedriver_linux64.zip
unzip chromedriver_linux64.zip
yum -y install https://dl.google.com/linux/chrome/rpm/stable/x86_64/google-chrome-stable-96.0.4664.110-1.x86_64.rpm
ln -s /usr/bin/google-chrome-stable /bin/chrome

3. Example of my working python script:

import undetected_chromedriver as uc
from selenium import webdriver

chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument('--no-sandbox')
chrome_options.add_argument('--headless')
chrome_options.add_argument('--enable-javascript')
chrome_options.add_argument('--disable-gpu')
user_agent = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.0 Safari/605.1.15'
chrome_options.add_argument('User-Agent={0}'.format(user_agent))
chrome_options.add_experimental_option("excludeSwitches", ["enable-automation"])
chrome_options.add_experimental_option('useAutomationExtension', True)

driver = uc.Chrome(executable_path='/path_to_your_driver/chromedriver',chrome_options=chrome_options,service_args=['--quiet'])
driver.implicitly_wait(6.5)

driver.get("https://google.com")

Hope this helps someone, as I wasted several days to find this solution!! :-)

Answer 4

remove all the things in the profile path.it works for me