ReadTimeout: HTTPSConnectionPool(host='acme-v01.api.letsencrypt.org', port=443): Read timed out. (read timeout=45)

Hello,

My domain is:
realtylink.skyerp.net

I ran this command:
certbot --nginx

It produced this output:
2018-01-09 23:33:52,284:DEBUG:urllib3.connectionpool:https://acme-v01.api.letsencrypt.org:443 “HEAD /acme/new-authz HTTP/1.1” 405 0
2018-01-09 23:33:52,286:DEBUG:acme.client:Received response:
HTTP 405
Server: nginx
Content-Type: application/problem+json
Content-Length: 91
Allow: POST
Replay-Nonce: 1iEB0hAiCcpglZ6YzatBfwj5Lf9nRmdZnh_HXYaHkVU
Expires: Tue, 09 Jan 2018 23:33:52 GMT
Cache-Control: max-age=0, no-cache, no-store
Pragma: no-cache
Date: Tue, 09 Jan 2018 23:33:52 GMT
Connection: keep-alive

2018-01-09 23:33:52,286:DEBUG:acme.client:Storing nonce: 1iEB0hAiCcpglZ6YzatBfwj5Lf9nRmdZnh_HXYaHkVU
2018-01-09 23:33:52,286:DEBUG:acme.client:JWS payload:
{
“identifier”: {
“type”: “dns”,
“value”: “realtylink.skyerp.net
},
“resource”: “new-authz”
}
2018-01-09 23:33:52,290:DEBUG:acme.client:Sending POST request to https://acme-v01.api.letsencrypt.org/acme/new-authz:
{
“protected”: "eyJub25jZSI6ICIxaUVCMGhBaUNjcGdsWjZZemF0QmZ3ajVMZjluUm1kWm5oX0hYWWFIa1ZVIiwgImFsZyI6ICJSUzI1NiIsICJqd2siOiB7ImUiOiAiQVFBQiIsICJrdHki$
“payload”: "ewogICJpZGVudGlmaWVyIjogewogICAgInR5cGUiOiAiZG5zIiwgCiAgICAidmFsdWUiOiAidmlzYTI0aC5za3llcnAubmV0IgogIH0sIAogICJyZXNvdXJjZSI6ICJuZXctYX$
“signature”: "BKd8IhCjludzsYwsF_hh9I68Y2b273IXqIbM6WA3qR5dlTdvuAxIvAUJs6eu7FNdldDYlHAE6lD0uNLewm0v5vhlHwJpskhaelbl0ZlYIA8cv1TBNX4e-1D6TQYf0kBSA9PX$
}
2018-01-09 23:34:37,334:DEBUG:certbot.log:Exiting abnormally:
Traceback (most recent call last):
File “/usr/bin/certbot”, line 11, in
load_entry_point(‘certbot==0.19.0’, ‘console_scripts’, ‘certbot’)()
File “/usr/lib/python2.7/dist-packages/certbot/main.py”, line 861, in main
return config.func(config, plugins)
File “/usr/lib/python2.7/dist-packages/certbot/main.py”, line 698, in run
certname, lineage)
File “/usr/lib/python2.7/dist-packages/certbot/main.py”, line 85, in _get_and_save_cert
lineage = le_client.obtain_and_enroll_certificate(domains, certname)
File “/usr/lib/python2.7/dist-packages/certbot/client.py”, line 357, in obtain_and_enroll_certificate
certr, chain, key, _ = self.obtain_certificate(domains)
File “/usr/lib/python2.7/dist-packages/certbot/client.py”, line 318, in obtain_certificate
self.config.allow_subset_of_names)
File “/usr/lib/python2.7/dist-packages/certbot/auth_handler.py”, line 66, in get_authorizations
self.authzr[domain] = self.acme.request_domain_challenges(domain)
File “/usr/lib/python2.7/dist-packages/acme/client.py”, line 212, in request_domain_challenges
typ=messages.IDENTIFIER_FQDN, value=domain), new_authzr_uri)
File “/usr/lib/python2.7/dist-packages/acme/client.py”, line 191, in request_challenges
response = self.net.post(self.directory.new_authz, new_authz)
File “/usr/lib/python2.7/dist-packages/acme/client.py”, line 682, in post
return self._post_once(*args, **kwargs)
File “/usr/lib/python2.7/dist-packages/acme/client.py”, line 693, in _post_once
response = self._send_request(‘POST’, url, data=data, **kwargs)
File “/usr/lib/python2.7/dist-packages/acme/client.py”, line 627, in _send_request
response = self.session.request(method, url, *args, **kwargs)
File “/usr/lib/python2.7/dist-packages/requests/sessions.py”, line 502, in request
resp = self.send(prep, **send_kwargs)
File “/usr/lib/python2.7/dist-packages/requests/sessions.py”, line 612, in send
r = adapter.send(request, **kwargs)
File “/usr/lib/python2.7/dist-packages/requests/adapters.py”, line 516, in send
raise ReadTimeout(e, request=request)
ReadTimeout: HTTPSConnectionPool(host=‘acme-v01.api.letsencrypt.org’, port=443): Read timed out. (read timeout=45)
2018-01-09 23:34:37,335:ERROR:certbot.log:An unexpected error occurred:

My web server is (include version):

The operating system my web server runs on is (include version):
ubuntu 16.04 LTS
My hosting provider, if applicable, is:

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

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