New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Cannot connect to host certificate verify failed #423

lcheng15 opened this Issue Dec 24, 2016 · 4 comments


None yet
5 participants

lcheng15 commented Dec 24, 2016

Hey guys

So I've just started trying to learn to build a Discord bot today but ran into this issue that's preventing me from running my bot.

I have installed Python 3.6 and the latest version of I ran into this SSL certificate issue when I tried to run my bot, which is only a couple of lines.

import stuff...

token = 'my bot token here'
client = discord.Client()

Instead of logging my bot in, I get the following error messages:

Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/aiohttp/", line 601, in _create_direct_connection
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/", line 802, in create_connection
sock, protocol_factory, ssl, server_hostname)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/", line 828, in _create_connection_transport
yield from waiter
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/", line 503, in data_received
ssldata, appdata = self._sslpipe.feed_ssldata(data)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/", line 201, in feed_ssldata
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/", line 683, in do_handshake
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/aiohttp/", line 304, in connect
yield from self._create_connection(req)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/aiohttp/", line 578, in _create_connection
transport, proto = yield from self._create_direct_connection(req)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/aiohttp/", line 624, in _create_direct_connection
(, req.port, exc.strerror)) from exc
aiohttp.errors.ClientOSError: [Errno 1] Can not connect to [[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749)]

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/Users/lcheng15/Dropbox/DiscordBot/", line 14, in
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/discord/", line 519, in run
self.loop.run_until_complete(self.start(*args, **kwargs))
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/", line 466, in run_until_complete
return future.result()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/discord/", line 490, in start
yield from self.login(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/discord/", line 416, in login
yield from getattr(self, 'login' + str(n))(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/discord/", line 346, in _login_1
data = yield from self.http.static_login(token, bot=is_bot)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/discord/", line 195, in static_login
data = yield from self.get(self.ME)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/discord/", line 105, in request
r = yield from self.session.request(method, url, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/aiohttp/", line 555, in iter
resp = yield from self._coro
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/aiohttp/", line 198, in _request
conn = yield from self._connector.connect(req)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/aiohttp/", line 314, in connect
.format(key, exc.strerror)) from exc
aiohttp.errors.ClientOSError: [Errno 1] Cannot connect to host ssl:True [Can not connect to [[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749)]]
Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x105cb2e80>

I have found others with the same error on the MusicBot's GitHub. They solved it by installing a certificate, which did not solve my problem. BTW, I'm running MacOS Sierra

I would really appreciate it if you guys could give me some help here. It's really frustrating when the first basic step fails. Thanks in advance!


This comment has been minimized.

ButterCheezii commented Jan 10, 2017

Yeah, I believe the macOS version of python 3.6 is fucked. You might have to stick with a linux or windows machine because all that I've seen doesn't work on my machine (that has the same issue). I have a VPS so it's not much of a problem anyway, but just a heads up.


This comment has been minimized.

omento commented Jan 10, 2017

Can confirm @ButterCheezii 's statement on my end. Using Python 3.6.0 in PyCharm (and terminal) on 10.10.5 resulted in the same error. Converting the project over to Python 3.5.2 fixed the issue. Didn't have to install a certificate or anything. Still trying to decide whether to use Heroku or pay $3 bucks a month for a VPS from OVH.

@Rapptz It may be worth mentioning this in the README


This comment has been minimized.


Rapptz commented Jan 12, 2017

I looked into this some more. Apparently 3.6 changed the installation process on OS X.

When you install there's this piece of information:

macOS users: If you are using the Python 3.6 from the binary installer linked on this page, please carefully read the Important Information displayed during installation; this information is also available after installation by clicking on /Applications/Python 3.6/ReadMe.rtf. There is important information there about changes in the 3.6.0 installer-supplied Python, particularly with regard to SSL certificate validation.

When you head over to the ReadMe.rtf file you get more information as well:

Certificate verification and OpenSSL
NEW This variant of Python 3.6 now includes its own private copy of OpenSSL 1.0.2. Unlike previous releases, the deprecated Apple-supplied OpenSSL libraries are no longer used. This also means that the trust certificates in system and user keychains managed by the Keychain Access application and the security command line utility are no longer used as defaults by the Python ssl module. For 3.6.0, a sample command script is included in /Applications/Python 3.6 to install a curated bundle of default root certificates from the third-party certifi package ( If you choose to use certifi, you should consider subscribing to the project's email update service to be notified when the certificate bundle is updated.
The bundled pip included with the Python 3.6 installer has its own default certificate store for verifying download connections.

Basically navigate to your Applications/Python 3.6/ folder and double click the Install Certificates.command.

Kind of a headache on the python dev group but also a pain from Apple's POV for providing deprecated binaries.


This comment has been minimized.

Juice805 commented Apr 27, 2017

@Cmoen11 A fix was posted here, worked for me

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment