{"id":228,"hash":"0e501f8479c4c017b27b52202c2ad526dd64aaf47c1f4e4162a8150e2cd3fb40","pattern":"pip install fails with "connection error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:598)"","full_message":"I am very new to Python and trying to > pip install linkchecker on Windows 7. Some notes:\n\npip install is failing no matter the package. For example, > pip install scrapy also results in the SSL error.\nVanilla install of Python 3.4.1 included pip 1.5.6. The first thing I tried to do was install linkchecker. Python 2.7 was already installed, it came with ArcGIS. python and pip were not available from the command line until I installed 3.4.1.\n> pip search linkchecker works. Perhaps that is because pip search does not verify the site's SSL certificate.\nI am in a company network but we do not go through a proxy to reach the Internet.\nEach company computer (including mine) has a Trusted Root Certificate Authority that is used for various reasons including enabling monitoring TLS traffic to https://google.com. Not sure if that has anything to do with it.\n\nHere are the contents of my pip.log after running pip install linkchecker:\n\nDownloading/unpacking linkchecker\n Getting page https://pypi.python.org/simple/linkchecker/\n Could not fetch URL https://pypi.python.org/simple/linkchecker/: connection error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:598)\n Will skip URL https://pypi.python.org/simple/linkchecker/ when looking for download links for linkchecker\n Getting page https://pypi.python.org/simple/\n Could not fetch URL https://pypi.python.org/simple/: connection error: HTTPSConnectionPool(host='pypi.python.org', port=443): Max retries exceeded with url: /simple/ (Caused by : Request-sent)\n Will skip URL https://pypi.python.org/simple/ when looking for download links for linkchecker\n Cannot fetch index base URL https://pypi.python.org/simple/\n URLs to search for versions for linkchecker:\n * https://pypi.python.org/simple/linkchecker/\n Getting page https://pypi.python.org/simple/linkchecker/\n Could not fetch URL https://pypi.python.org/simple/linkchecker/: connection error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:598)\n Will skip URL https://pypi.python.org/simple/linkchecker/ when looking for download links for linkchecker\n Could not find any downloads that satisfy the requirement linkchecker\nCleaning up...\n Removing temporary dir C:\\Users\\jcook\\AppData\\Local\\Temp\\pip_build_jcook...\nNo distributions at all found for linkchecker\nException information:\nTraceback (most recent call last):\n File \"C:\\Python34\\lib\\site-packages\\pip\\basecommand.py\", line 122, in main\n status = self.run(options, args)\n File \"C:\\Python34\\lib\\site-packages\\pip\\commands\\install.py\", line 278, in run\n requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)\n File \"C:\\Python34\\lib\\site-packages\\pip\\req.py\", line 1177, in prepare_files\n url = finder.find_requirement(req_to_install, upgrade=self.upgrade)\n File \"C:\\Python34\\lib\\site-packages\\pip\\index.py\", line 277, in find_requirement\n raise DistributionNotFound('No distributions at all found for %s' % req)\npip.exceptions.DistributionNotFound: No distributions at all found for linkchecker\n\nFor this error message in your own code (using urllib, urllib2, requests etc. to attempt a connection using SSL), see urllib and \"SSL: CERTIFICATE_VERIFY_FAILED\" Error .","ecosystem":"pypi","package_name":"windows","package_version":null,"solution":"This solution is insecure and can lead to other issues like man-in-the-middle attacks. This was given as a solution where the issue is trying to access package repository behind corporate firewalls, and even then is unsafe. Please understand the security risks before considering this as a solution.\n\nuse trusted-host in either pip.conf or command line argument\nYou can ignore SSL errors by setting pypi.org and files.pythonhosted.org as well as the older pypi.python.org as trusted hosts.\n\n$ pip install --trusted-host pypi.org --trusted-host pypi.python.org --trusted-host files.pythonhosted.org \n\nNote: Sometime during April 2018, the Python Package Index was migrated from pypi.python.org to pypi.org. This means \"trusted-host\" commands using the old domain no longer work, but you can add both.\n\nPermanent Fix\nSince the release of pip 10.0, you should be able to fix this permanently just by upgrading pip itself:\n\n$ pip install --trusted-host pypi.org --trusted-host pypi.python.org --trusted-host files.pythonhosted.org pip setuptools\n\nOr by just reinstalling it to get the latest version:\n\n$ curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py\n\n(… and then running get-pip.py with the relevant Python interpreter).\n\npip install should just work after this. If not, then you will need to do more, as explained below.\n\nYou may want to add the trusted hosts and proxy to your config file.\n\npip.ini (Windows) or pip.conf (unix)\n\n[global]\ntrusted-host = pypi.python.org\n pypi.org\n files.pythonhosted.org\n\nAlternate Solutions (Less secure)\n\nAll of these answers shared to this question have a security risk associated with them, whether it is to disable SSL verification, add trusted domain, use self signed certificates, etc. Use this solution only if you are behind a corporate firewall and you understand that the risk are handled.\n\nTwo of the workarounds that help in installing most of the python packages with ease would be:\n\nUsing easy_install: if you are really lazy and don't want to waste much time, use easy_install . Note that some packages won't be found or will give small errors.\nUsing Wheel: download the Wheel of the python package and use the pip command pip install wheel_package_name.whl to install the package.","confidence":0.95,"source":"stackoverflow","source_url":"https://stackoverflow.com/questions/25981703/pip-install-fails-with-connection-error-ssl-certificate-verify-failed-certi","votes":789,"created_at":"2026-04-19T04:41:35.774157+00:00","updated_at":"2026-04-19T04:51:47.821285+00:00"}