Like I’ve written in a comment, this problem is probably related to this SO answer.

In short: there are multiple ways to verify the certificate. The verification used by OpenSSL is incompatible with the trusted root certificates you have on your system. OpenSSL is used by Python.

You could try to get the missing certificate for Verisign Class 3 Public Primary Certification Authority and then use the cafile option according to the Python documentation:

urllib2.urlopen(req, cafile="verisign.pem")

Like you, I am using python 2.7 on my old iMac (OS X 10.6.8), I met the problem too, using urllib2.urlopen :

urlopen error [SSL: CERTIFICATE_VERIFY_FAILED]

My programs were running fine without SSL certificate problems and suddently (after dowloading programs), they crashed with this SSL error.

The problem was the version of python used :

1. No problem with https://www.python.org/downloads and python-2.7.9-macosx10.6.pkg

2. problem with the one instaled by Homebrew tool : “brew install python”, version located in /usr/local/bin.

A chapter, called Certificate verification and OpenSSL [CHANGED for Python 2.7.9], in /Applications/Python 2.7/ReadMe.rtf explains the problem with many details.

So, check, download and put in your PATH the right version of python.

On Windows, Python does not look at the system certificate, it uses its own located at ?libsite-packagescertificacert.pem.

The solution to your problem:

1. download the domain validation certificate as *.crt or *pem file
2. open the file in editor and copy it’s content to clipboard
3. find your cacert.pem location: from requests.utils import DEFAULT_CA_BUNDLE_PATH; print(DEFAULT_CA_BUNDLE_PATH)
4. edit the cacert.pem file and paste your domain validation certificate at the end of the file.
5. Save the file and enjoy requests!

I hang my head in semi-shame, as I had the same issue, except that in my case, the URL I was hitting was valid, the certificate was valid. What wasn’t valid was my connection out to the web. I had failed to add proxy details into the browser (IE in this case). This stopped the verification process from happening correctly.
Added in the proxy details and my python was then very happy .

If your on vCenter 6, you should instead add your vCenter’s vmware certificate authority cert to your OS’s list of trusted CA’s. To download your cert do the following

1. Open your Web browser.
2. Navigate to https://
3. In the lower right-hand corner, click the Download Trusted Root CA link

On Fedora

1. unzip and change the extension from .0 to .cer
2. Copy it to the /etc/pki/ca-trust/source/anchors/
3. run the update-ca-trust command.

Links:

1. https://virtualizationreview.com/articles/2015/04/02/install-root-self-signed-certificate-vcenter-6.aspx?m=1
2. http://forums.fedoraforum.org/showthread.php?t=293856

For Python 3.4+ on Centos 6/7,Fedora, just install the trusted CA this way :

1. Copy the CA.crt to /etc/pki/ca-trust/source/anchors/
2. update-ca-trust force-enable
3. update-ca-trust extract

Python 2.7.12 (default, Jul 29 2016, 15:26:22) fixed the mentioned issue. This information might help someone else.

import requests
requests.packages.urllib3.disable_warnings()

import ssl

try:
    _create_unverified_https_context = ssl._create_unverified_context
except AttributeError:
    # Legacy Python that doesn't verify HTTPS certificates by default
    pass
else:
    # Handle target environment that doesn't support HTTPS verification
    ssl._create_default_https_context = _create_unverified_https_context

Taken from here https://gist.github.com/michaelrice/a6794a017e349fc65d01

You could try adding this to your environment variables:

PYTHONHTTPSVERIFY=0 

Note that this will disable all HTTPS verification so is a bit of a sledgehammer approach, however if verification isn’t required it may be an effective solution.

This isn’t a solution to your specific problem, but I’m putting it here because this thread is the top Google result for "SSL: CERTIFICATE_VERIFY_FAILED", and it lead me on a wild goose chase.

If you have installed Python 3.6 on OSX and are getting the "SSL: CERTIFICATE_VERIFY_FAILED" error when trying to connect to an https:// site, it’s probably because Python 3.6 on OSX has no certificates at all, and can’t validate any SSL connections. This is a change for 3.6 on OSX, and requires a post-install step, which installs the certifi package of certificates. This is documented in the file ReadMe.rtf, which you can find at /Applications/Python 3.6/ReadMe.rtf (see also the file Conclusion.rtf, and the script build-installer.py that generates the macOS installer).

The ReadMe will have you run the post-install script at

/Applications/Python 3.10/Install Certificates.command (Terminal App, this command alone should, fix the issue. Be sure to update the file path using your current subversion.)

(its source is install_certificates.command), which:

• first installs the Python package certifi, and
• then creates a symbolic link from the OpenSSL certificates file to the certificates file installed by the package certifi.

Release notes have some more info: https://www.python.org/downloads/release/python-360/

On newer versions of Python, there is more documentation about this:

• https://github.com/python/cpython/blob/e05a703848473b0365886dcc593cbddc46609f29/Mac/BuildScript/resources/ReadMe.rtf#L22-L34
• https://github.com/python/cpython/blob/e05a703848473b0365886dcc593cbddc46609f29/Mac/BuildScript/resources/Conclusion.rtf#L15-L19
• https://github.com/python/cpython/blob/e05a703848473b0365886dcc593cbddc46609f29/Mac/BuildScript/resources/Welcome.rtf#L23-L25
• https://github.com/python/cpython/blob/e05a703848473b0365886dcc593cbddc46609f29/Mac/BuildScript/resources/install_certificates.command
• https://github.com/python/cpython/blob/e05a703848473b0365886dcc593cbddc46609f29/Mac/BuildScript/README.rst
• https://github.com/python/cpython/blob/e05a703848473b0365886dcc593cbddc46609f29/Mac/BuildScript/build-installer.py#L239-L246

ln -s /usr/local/share/certs/ca-root-nss.crt /etc/ssl/cert.pem

(FreeBSD 10.1)

Try

pip install –trusted-host pypi.python.org packagename

It worked for me.

To expand on Craig Glennie’s answer:

in Python 3.6.1 on MacOs Sierra

Entering this in the bash terminal solved the problem:

pip install certifi
/Applications/Python 3.6/Install Certificates.command

I need to add another answer because just like Craig Glennie, I went on a wild goose chase due to the many posts referring to this problem across the Web.

I am using MacPorts, and what I originally thought was a Python problem was in fact a MacPorts problem: it does not install a root certificate with its installation of openssl. The solution is to port install curl-ca-bundle, as mentioned in this blog post.

Take a look at

/Applications/Python 3.6/Install Certificates.command

You can also go to the Applications folder in Finder and click on Certificates.command

installing steps for nltk (I had python3 (3.6.2) installed already in MAC OS X

sudo easy_install pip

use ignore installed option to ignore uninstalling previous version of six, else, it gives an error while uninstalling and does not movie forward

sudo pip3 install -U nltk --ignore-installed six

Check the installation of pip and python, use the ‘3’ versions

which python python2 python3
which pip pip2 pip3

Check if NLTK is installed

python3
import nltk
nltk.__path__
['/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/nltk']

Install SSL certificate prior to installing the examples book, else we will certificate error while installing the examples

/Applications/Python 3.6/Install Certificates.command
python3 -m nltk.downloader book

That completed the installation successfully of nltk and nltk_ata for book examples

I am surprised all these instruction didn’t solved my problem. Nonetheless, the diagnostic is correct (BTW, I am using Mac and Python3.6.1). So, to summarize the correct part :

• On Mac, Apple is dropping OpenSSL
• Python now uses it own set of CA Root Certificate
• Binary Python installation provided a script to install the CA Root certificate Python needs (“/Applications/Python 3.6/Install Certificates.command”)
• Read “/Applications/Python 3.6/ReadMe.rtf” for details

For me, the script doesn’t work, and all those certifi and openssl installation failed to fix too. Maybe because I have multiple python 2 and 3 installations, as well as many virtualenv. At the end, I need to fix it by hand.

pip install certifi   # for your virtualenv
mkdir -p /Library/Frameworks/Python.framework/Versions/3.6/etc/openssl
cp -a <your virtualenv>/site-package/certifi/cacert.pem 
  /Library/Frameworks/Python.framework/Versions/3.6/etc/openssl/cert.pem

If that still fails you. Then re/install OpenSSL as well.

port install openssl

I was having a similar problem, though I was using urllib.request.urlopen in Python 3.4, 3.5, and 3.6. (This is a portion of the Python 3 equivalent of urllib2, per the note at the head of Python 2’s urllib2 documentation page.)

My solution was to pip install certifi to install certifi, which has:

… a carefully curated collection of Root Certificates for validating the trustworthiness of SSL certificates while verifying the identity of TLS hosts.

Then, in my code where I previously just had:

import urllib.request as urlrq

resp = urlrq.urlopen('https://example.com/bar/baz.html')

I revised it to:

import urllib.request as urlrq
import certifi

resp = urlrq.urlopen('https://example.com/bar/baz.html', cafile=certifi.where())

If I read the urllib2.urlopen documentation correctly, it also has a cafile argument. So, urllib2.urlopen([...], certifi.where()) might work for Python 2.7 as well.

UPDATE (2020-01-01): As of Python 3.6, the cafile argument to urlopen has been deprecated, with the context argument supposed to be specified instead. I found the following to work equally well on 3.5 through 3.8:

import urllib.request as urlrq
import certifi
import ssl

resp = urlrq.urlopen('https://example.com/bar/baz.html', context=ssl.create_default_context(cafile=certifi.where()))

Installing PyOpenSSL using pip worked for me (without converting to PEM):

pip install PyOpenSSL

I had this problem solved by closing Fiddler (an HTTP debugging proxy) check if you have a proxy enabled and try again.

My solution for Mac OS X:

1. Upgrade to Python 3.6.5 using the native app Python installer downloaded from the official Python language website https://www.python.org/downloads/

I’ve found that this installer is taking care of updating the links and symlinks for the new Python a lot better than homebrew.

2. Install a new certificate using "./Install Certificates.command" which is in the refreshed Python 3.6 directory

cd "/Applications/Python 3.6/"
sudo "./Install Certificates.command"

Python 2.7 on Amazon EC2 with centOS 7

I had to set the env variable SSL_CERT_DIR to point to my ca-bundle which was located at /etc/ssl/certs/ca-bundle.crt

In python 2.7 adding Trusted root CA details at the end in file C:Python27libsite-packagescertificacert.pem helped

after that i did run (using admin rights)
pip install –trusted-host pypi.python.org –trusted-host pypi.org –trusted-host files.pythonhosted.org packageName

For anyone using mechanize who comes across this question, here’s how you can apply the same technique to a mechanize Browser instance:

br = mechanize.Browser()
context = ssl._create_unverified_context()
br.set_ca_data(context=context)

Installing certifi on Mac solved my issue:

pip install certifi

I have found this over here

I found this solution, insert this code at the beginning of your source file:

import ssl

try:
   _create_unverified_https_context = ssl._create_unverified_context
except AttributeError:
    # Legacy Python that doesn't verify HTTPS certificates by default
    pass
else:
    # Handle target environment that doesn't support HTTPS verification
    ssl._create_default_https_context = _create_unverified_https_context

This code makes the verification undone so that the ssl certification is not verified.

For Linux Python3.6, this worked for me.

from command line install pyopenssl and certifi

sudo pip3 install -U pyopenssl
sudo pip3 install certifi

and in my python3 script, added verify=’/usr/lib/python3.6/site-packages/certifi/cacert.pem’ like this:

import requests
from requests.auth import HTTPBasicAuth
import certifi

auth = HTTPBasicAuth('username', 'password')
body = {}

r = requests.post(url='https://your_url.com', data=body, auth=auth, verify='/usr/lib/python3.6/site-packages/certifi/cacert.pem')

Solution for Anaconda

My setup is Anaconda Python 3.7 on MacOS with a proxy. The paths are different.

• This is how you get the correct certificates path:

import ssl
ssl.get_default_verify_paths()

which on my system produced

Out[35]: DefaultVerifyPaths(cafile='/miniconda3/ssl/cert.pem', capath=None,
 openssl_cafile_env='SSL_CERT_FILE', openssl_cafile='/miniconda3/ssl/cert.pem',
 openssl_capath_env='SSL_CERT_DIR', openssl_capath='/miniconda3/ssl/certs')

Once you know where the certificate goes, then you concatenate the certificate used by the proxy to the end of that file.

I had already set up conda to work with my proxy, by running:

conda config --set ssl_verify <pathToYourFile>.crt

If you don’t remember where your cert is, you can find it in ~/.condarc:

ssl_verify: <pathToYourFile>.crt

Now concatenate that file to the end of /miniconda3/ssl/cert.pem
and requests should work, and in particular sklearn.datasets and similar tools
should work.

Further Caveats

The other solutions did not work because the Anaconda setup is slightly different:

• The path Applications/Python 3.X simply doesn’t exist.

• The path provided by the commands below is the WRONG path

from requests.utils import DEFAULT_CA_BUNDLE_PATH
DEFAULT_CA_BUNDLE_PATH

In my case I was getting this error because requests and urllib3 versions were incompatible, giving the following error during installation:

ERROR: requests 2.21.0 has requirement urllib3<1.25,>=1.21.1, but you'll have urllib3 1.25 which is incompatible.

pip install 'urllib3<1.25' --force-reinstall

did the trick.

Another Anaconda solution. I was getting CERTIFICATE_VERIFY_FAILED in my Python 2.7 environment on macOS. It turns out the conda paths were bad:

base (3.7) environment:

>>> import ssl
>>> ssl.get_default_verify_paths()
DefaultVerifyPaths(cafile='/usr/local/anaconda3/ssl/cert.pem', capath=None, openssl_cafile_env='SSL_CERT_FILE', openssl_cafile='/usr/local/anaconda3/ssl/cert.pem', openssl_capath_env='SSL_CERT_DIR', openssl_capath='/usr/local/anaconda3/ssl/certs')

2.7 environment (paths did not exist!):

DefaultVerifyPaths(cafile='', capath=None, openssl_cafile_env='SSL_CERT_FILE', openssl_cafile='/usr/local/anaconda3/envs/py27/ssl/cert.pem', openssl_capath_env='SSL_CERT_DIR', openssl_capath='/usr/local/anaconda3/envs/py27/ssl/certs')

The fix:

cd /usr/local/anaconda3/envs/py27/
mkdir ssl
cd ssl
ln -s ../../../ssl/cert.pem

Already lots of answers here, but we ran into this in a very specific case and blew a lot of time investigating, so adding yet another one. We saw it in the following case:

• In a debian-stretch-slim docker container
• Default Python 3.5.3 easy_install3
• For LetsEncrypt certificates registered using cert-manager in our Kubernetes cluster

pip3 and openssl command line were both able to verify the cert and easy_install3 was able to verify other LetsEncrypt certs successfully.

The workaround was to build the latest Python (3.7.3 at the time) from source. The instructions here are detailed and easy to follow.

I had a similar problem on one of my Linux machines. Generating fresh certificates and exporting an environment variable pointing to the certificates directory fixed it for me:

$ sudo update-ca-certificates --fresh
$ export SSL_CERT_DIR=/etc/ssl/certs

$ cd $HOME
$ wget --quiet https://curl.haxx.se/ca/cacert.pem
$ export SSL_CERT_FILE=$HOME/cacert.pem

Source: https://access.redhat.com/articles/2039753

The SSL: CERTIFICATE_VERIFY_FAILED error could also occur because an Intermediate Certificate is missing in the ca-certificates package on Linux. For example, in my case the intermediate certificate “DigiCert SHA2 Secure Server CA” was missing in the ca-certificates package even though the Firefox browser includes it. You can find out which certificate is missing by directly running the wget command on the URL causing this error. Then you can search for the corresponding link to the CRT file for this certificate from the official website (e.g. https://www.digicert.com/digicert-root-certificates.htm in my case) of the Certificate Authority. Now, to include the certificate that is missing in your case, you may run the below commands using your CRT file download link instead:

wget https://cacerts.digicert.com/DigiCertSHA2SecureServerCA.crt

mv DigiCertSHA2SecureServerCA.crt DigiCertSHA2SecureServerCA.der

openssl x509 -inform DER -outform PEM -in DigiCertSHA2SecureServerCA.der -out DigicertSHA2SecureServerCA.pem.crt

sudo mkdir /usr/share/ca-certificates/extra

sudo cp DigicertSHA2SecureServerCA.pem.crt /usr/share/ca-certificates/extra/

sudo dpkg-reconfigure ca-certificates

After this you may test again with wget for your URL as well as by using the python urllib package. For more details, refer to: https://bugs.launchpad.net/ubuntu/+source/ca-certificates/+bug/1795242

There are cases when you can not use insecure connections or pass ssl context into urllib request. Here my solution based on
https://stackoverflow.com/a/28052583/6709778

In a case if you want use your own cert file

import ssl

def new_ssl_context_decorator(*args, **kwargs):
    kwargs['cafile'] = '/etc/ssl/certs/ca-certificates.crt'
    return ssl.create_default_context(*args, **kwargs)

ssl._create_default_https_context = ssl._create_unverified_context

or you can use shared file from certifi

def new_ssl_context_decorator(*args, **kwargs):
    import certifi
    kwargs['cafile'] = certifi.where()
    return ssl.create_default_context(*args, **kwargs)

If you have private certs to deal with, like your orgs own CA root and intermediates part of the chain, then better to add the certs to the ca file viz. cacert.pem than bypassing the entire security apparatus (verify=False). Below code gets you going in both 2.7+ and 3+

Consider adding the whole cert chain and off course you need to do this only once.

import certifi

cafile=certifi.where() # cacert file
with open ('rootca.pem','rb') as infile:
    customca=infile.read()
    with open(cafile,'ab') as outfile:
        outfile.write(customca)
with open ('interca.pem','rb') as infile:
    customca=infile.read()
    with open(cafile,'ab') as outfile:
        outfile.write(customca)
with open ('issueca.pem','rb') as infile:
    customca=infile.read()
    with open(cafile,'ab') as outfile:
        outfile.write(customca)

Then this should get you going

import requests
response = requests.request("GET", 'https://yoursecuresite.com',  data = {})
print(response.text.encode('utf8'))

Hope this helps

I had this problem with Python 2.7.9

Here is what I did:

• Uninstalled Python 2.7.9
• Deleted c:Python27 folder
• Downloaded Python 2.7.18 which is the latest Python 2.7 release today.
• Re-run my application
• And it worked!

There isnt any "[CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:581)" error anymore.

import request
response = requests.get("url/api that you want to hit", verify="path to ssl certificate")

For me the problem was that none of the above answers completely helped me but gave me the right direction to look at.

For sure, SSL certificate is needed but when you are behind the company’s firewall then publicly available certificates might not help. You might need to reach out to the IT department of your company to obtain the certificate as each company uses special certificate from the security provider they have contracted the services from. And place it in a folder and pass the path to that folder as an argument to verify parameter.

For me even after trying all the above solutions and using the wrong certificate I was not able to make it work. So just remember for those who are behind company’s firewall to obtain the right certificate. It can make a difference between success and failure of your request call.

In my case I placed the certificate in the following path and it worked like magic.

C:Program FilesCommon Filesssl

You could also refer https://2.python-requests.org/en/master/user/advanced/#id3 which talks about ssl verification

I was getting the same error, and also went on a wild goose chase for quite a while before I gave up and started trying things on my own. I eventually figured it out, so I thought I’d share. In my case, I am running Python 2.7.10 (due to reasons beyond my control) on Linux, don’t have access to the requests module, can’t install certificates globally at the OS or Python level, can’t set any environment variables, and need to access a specific internal site that uses internally issued certificates.

NOTE: Disabling SSL verification was never an option. I’m downloading a script that immediately runs as root. Without SSL verification, any web server could pretend to be my target host, and I’d just accept whatever they give me and run it as root!

I saved the root and intermediate certificates (there may be more than one) in pem format to a single file, then used the following code:

import ssl,urllib2
data = urllib2.build_opener(urllib2.HTTPSHandler(context=ssl.create_default_context(cafile='/path/to/ca-cert-chain.pem')), urllib2.ProxyHandler({})).open('https://your-site.com/somefile').read()
print(data)

Note that I added urllib2.ProxyHandler({}) there. That’s because in our environment proxies are set up by default, but they can only access external sites, not internal ones. Without the proxy bypass, I cannot access internal sites. If you don’t have that problem, you can simplify as follows:

data = urllib2.build_opener(urllib2.HTTPSHandler(context=ssl.create_default_context(cafile='/path/to/ca-cert-chain.pem'))).open('https://your-site.com/somefile').read()

Works like a charm, and does not compromise security.

Enjoy!

If the certificate is issued through Let’s encrypt make sure to remove the expired DST Root CA X3 issued R3 certificate in your Intermediate cert store on the client.

My solution was to use Beautiful Soup a python package. It magically handles the SSL stuff. Beautiful Soup is a library that makes it easy to scrape information from web pages.

from bs4 import BeautifulSoup as soup
import requests
url = "https://dex.raydium.io/#/market/2xiv8A5xrJ7RnGdxXB42uFEkYHJjszEhaJyKKt4WaLep"
html = requests.get(url, verify=True)
 
page_soup = soup(html.text, 'html.parser')
print(page_soup.prettify())

I think you have several ways for fix this issue. I mentioned 5 ways below:

1. You can define context for each request and pass the context on each request for use it like below:

import certifi
import ssl
import urllib
context = ssl.create_default_context(cafile=certifi.where())
result = urllib.request.urlopen('https://www.example.com', context=context)

2. OR Set certificate file in environment.

import os
import certifi
import urllib
os.environ["REQUESTS_CA_BUNDLE"] = certifi.where()
os.environ["SSL_CERT_FILE"] = certifi.where()
result = urllib.request.urlopen('https://www.example.com')

3. OR Replace create default https context method:

import certifi
import ssl
ssl._create_default_https_context = lambda: ssl.create_default_context(cafile=certifi.where())
result = urllib.request.urlopen('https://www.example.com')

4. OR If you use Linux machine, generating fresh certificates and exporting an environment variable pointing to the certificates directory fixed it.

$ sudo update-ca-certificates --fresh
$ export SSL_CERT_DIR=/etc/ssl/certs

5. OR If you use Mac machine, generating fresh certificates

$ cd "/Applications/$(python3 --version | awk '{print $2}'| awk  -F. '{print "Python " $1"."$2}')"
$ sudo "./Install Certificates.command"

You can install the package in python using the below command

In Jupiter notebook

!pip install --trusted-host=pypi.org --trusted-host=files.pythonhosted.org --user [Pacakage name]

!pip install --trusted-host=pypi.org --trusted-host=files.pythonhosted.org --user xgboost

Please note I have tried Install Certificates.command in mac and windows noting helped