I am also seeing this error in my domain (ronanarraes.com). In my case, I am trying to add a subdomain to my certificate.
EDIT: here is the response I get:
2019-11-17 11:44:46,857:DEBUG:acme.client:Received response:
HTTP 500
content-length: 112
cache-control: public, max-age=0, no-cache
server: nginx
connection: keep-alive
link: <https://acme-v02.api.letsencrypt.org/directory>;rel="index"
boulder-requester: 38922151
date: Sun, 17 Nov 2019 14:44:46 GMT
content-type: application/problem+json
replay-nonce: 0001yyj8G-ivaCWKYE5w1VNP-jumde0wTYH4Ekr82Pwj-1I
{
"type": "urn:ietf:params:acme:error:serverInternal",
"detail": "Error finalizing order",
"status": 500
}
2019-11-17 11:44:46,857:DEBUG:certbot.log:Exiting abnormally:
Traceback (most recent call last):
File "/usr/bin/certbot", line 9, in <module>
load_entry_point('certbot==0.39.0', 'console_scripts', 'certbot')()
File "/usr/lib/python2.7/site-packages/certbot/main.py", line 1378, in main
return config.func(config, plugins)
File "/usr/lib/python2.7/site-packages/certbot/main.py", line 1265, in certonly
lineage = _get_and_save_cert(le_client, config, domains, certname, lineage)
File "/usr/lib/python2.7/site-packages/certbot/main.py", line 116, in _get_and_save_cert
renewal.renew_cert(config, domains, le_client, lineage)
File "/usr/lib/python2.7/site-packages/certbot/renewal.py", line 307, in renew_cert
new_cert, new_chain, new_key, _ = le_client.obtain_certificate(domains, new_key)
File "/usr/lib/python2.7/site-packages/certbot/client.py", line 364, in obtain_certificate
cert, chain = self.obtain_certificate_from_csr(csr, orderr)
File "/usr/lib/python2.7/site-packages/certbot/client.py", line 296, in obtain_certificate_from_csr
orderr = self.acme.finalize_order(orderr, deadline)
File "/usr/lib/python2.7/site-packages/acme/client.py", line 920, in finalize_order
return self.client.finalize_order(orderr, deadline)
File "/usr/lib/python2.7/site-packages/acme/client.py", line 752, in finalize_order
self._post(orderr.body.finalize, wrapped_csr)
File "/usr/lib/python2.7/site-packages/acme/client.py", line 95, in _post
return self.net.post(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/acme/client.py", line 1194, in post
return self._post_once(*args, **kwargs)
File "/usr/lib/python2.7/site-packages/acme/client.py", line 1208, in _post_once
response = self._check_response(response, content_type=content_type)
File "/usr/lib/python2.7/site-packages/acme/client.py", line 1063, in _check_response
raise messages.Error.from_json(jobj)
Error: urn:ietf:params:acme:error:serverInternal :: The server experienced an internal error :: Error finalizing order
2019-11-17 11:44:46,859:ERROR:certbot.log:An unexpected error occurred:
2019-11-17 11:44:46,859:ERROR:certbot.log:The server experienced an internal error :: Error finalizing order