How to fix "Cannot connect to server" exception? - python-3.x

Question

I was setting up chromedriver with selenium, using the test script provided on the chromdriver website. Everything worked fine, until I switched to a different WiFi network. Now I'm getting an error message when running my script.
I have searched the web for solutions, and I've tried the following things:
Made sure the chromedriver version matches my chrome version.
Try to whitelist the ip-address
I checked for 127.0.0.1 localhost in /etc/hosts
The test code I'm running (/path/to/my/chromedriver is correct):
import time
from selenium import webdriver
driver = webdriver.Chrome("/path/to/my/chromedriver") # Optional argument, if not specified will search path.
driver.get('http://www.google.com/xhtml');
time.sleep(5) # Let the user actually see something!
search_box = driver.find_element_by_name('q')
search_box.send_keys('ChromeDriver')
search_box.submit()
time.sleep(5) # Let the user actually see something!
driver.quit()
I'm expecting the program to run fine, and the browser should pop up. However, the browser is not popping up and I'm getting the following error message:
File "test.py", line 4, in
driver = webdriver.Chrome("/path/to/my/chromedriver") # Optional argument, if not specified will search path.
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in init
self.service.start()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/selenium/webdriver/common/service.py", line 104, in start
raise WebDriverException("Can not connect to the Service %s" % self.path)
selenium.common.exceptions.WebDriverException: Message: Can not connect to the Service /path/to/my/chromedriver
When running the chromedriver in the terminal I'm getting the following message (and the browser is also not popping up as supposed to):
Only local connections are allowed.
Please protect ports used by ChromeDriver and related test frameworks to prevent access by malicious code.
EDIT: I have the same problem with the geckodriver for firefox, so it is not specific for Chrome.