I found this topic which is pretty much the same issue:
However removing and re-installing the 'certbot' package did not resolve the issue. For now, I'm adding
no-verify-ssl = true to the cli.ini file to work around this, but would like to see a more secure solution.
Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
My domain is: rflm.net
I ran this command: certbot certonly --register-unsafely-without-email --config-dir /tmp/lets_encrypt -d box.rflm.net,rflm.net,www.rflm.net
It produced this output:
root@box:~# certbot certonly --register-unsafely-without-email --config-dir /tmp/lets_encrypt -d box.rflm.net,rflm.net,www.rflm.net
Saving debug log to /var/log/letsencrypt/letsencrypt.log
How would you like to authenticate with the ACME CA?
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1: Spin up a temporary webserver (standalone)
2: Place files in webroot directory (webroot)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 2
Plugins selected: Authenticator webroot, Installer None
From cffi callback <function _verify_callback at 0x7f5f8333ebf8>:
Traceback (most recent call last):
File "/usr/local/lib/python3.4/dist-packages/OpenSSL/SSL.py", line 309, in wrapper
_lib.X509_up_ref(x509)
AttributeError: 'module' object has no attribute 'X509_up_ref'
An unexpected error occurred:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/urllib3/contrib/pyopenssl.py", line 438, in wrap_socket
cnx.do_handshake()
File "/usr/local/lib/python3.4/dist-packages/OpenSSL/SSL.py", line 1907, in do_handshake
self._raise_ssl_error(self._ssl, result)
File "/usr/local/lib/python3.4/dist-packages/OpenSSL/SSL.py", line 1639, in _raise_ssl_error
_raise_current_error()
File "/usr/local/lib/python3.4/dist-packages/OpenSSL/_util.py", line 54, in exception_from_error_queue
raise exception_type(errors)
OpenSSL.SSL.Error: [('SSL routines', 'SSL3_GET_SERVER_CERTIFICATE', 'certificate verify failed')]
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 600, in urlopen
chunked=chunked)
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 345, in _make_request
self._validate_conn(conn)
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 846, in _validate_conn
conn.connect()
File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 326, in connect
ssl_context=context)
File "/usr/lib/python3/dist-packages/urllib3/util/ssl_.py", line 325, in ssl_wrap_socket
return context.wrap_socket(sock, server_hostname=server_hostname)
File "/usr/lib/python3/dist-packages/urllib3/contrib/pyopenssl.py", line 445, in wrap_socket
raise ssl.SSLError('bad handshake: %r' % e)
ssl.SSLError: ("bad handshake: Error([('SSL routines', 'SSL3_GET_SERVER_CERTIFICATE', 'certificate verify failed')],)",)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/requests/adapters.py", line 440, in send
timeout=timeout
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 630, in urlopen
raise SSLError(e)
urllib3.exceptions.SSLError: ("bad handshake: Error([('SSL routines', 'SSL3_GET_SERVER_CERTIFICATE', 'certificate verify failed')],)",)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/bin/certbot", line 11, in <module>
load_entry_point('certbot==0.26.1', 'console_scripts', 'certbot')()
File "/usr/lib/python3/dist-packages/certbot/main.py", line 1364, in main
return config.func(config, plugins)
File "/usr/lib/python3/dist-packages/certbot/main.py", line 1238, in certonly
le_client = _init_le_client(config, auth, installer)
File "/usr/lib/python3/dist-packages/certbot/main.py", line 648, in _init_le_client
return client.Client(config, acc, authenticator, installer, acme=acme)
File "/usr/lib/python3/dist-packages/certbot/client.py", line 247, in __init__
acme = acme_from_config_key(config, self.account.key, self.account.regr)
File "/usr/lib/python3/dist-packages/certbot/client.py", line 50, in acme_from_config_key
return acme_client.BackwardsCompatibleClientV2(net, key, config.server)
File "/usr/lib/python3/dist-packages/acme/client.py", line 744, in __init__
directory = messages.Directory.from_json(net.get(server).json())
File "/usr/lib/python3/dist-packages/acme/client.py", line 1078, in get
self._send_request('GET', url, **kwargs), content_type=content_type)
File "/usr/lib/python3/dist-packages/acme/client.py", line 1027, in _send_request
response = self.session.request(method, url, *args, **kwargs)
File "/usr/lib/python3/dist-packages/requests/sessions.py", line 502, in request
resp = self.send(prep, **send_kwargs)
File "/usr/lib/python3/dist-packages/requests/sessions.py", line 612, in send
r = adapter.send(request, **kwargs)
File "/usr/lib/python3/dist-packages/requests/adapters.py", line 514, in send
raise SSLError(e, request=request)
requests.exceptions.SSLError: ("bad handshake: Error([('SSL routines', 'SSL3_GET_SERVER_CERTIFICATE', 'certificate verify failed')],)",)
Please see the logfiles in /var/log/letsencrypt for more details.
My web server is (include version): nginx 1.4.6-1ubuntu3.8
The operating system my web server runs on is (include version): Ubuntu 14.04.5 LTS
My hosting provider, if applicable, is: Digital Ocean
I can login to a root shell on my machine (yes or no, or I don't know): Yes
I'm using a control panel to manage my site (no, or provide the name and version of the control panel): No.