Dear BuyPass Technical Dept,

I tried with DNS-01 Challenge validation.

but the error is as below

Please solve the below error .

Thanks

=============================================

Waiting for verification...
Cleaning up challenges
{"cmd": "cleanup", "type": "dns-01", "status": "pending", "domain": "ssl**.****.kr", "token": "55CD56F8E5B88005239084F3219A39B49B06D114", "validation": "7GWQuEKlxdPgfVQtwo8Vb8scLu3Iveo9Qdg_e34S1kE", "key_auth": "55CD56F8E5B88005239084F3219A39B49B06D114.e7lUZ6opjBXHkciwtBljSkZRwFfxriieJzqpkXEjZZ0", "validated": null, "error": null}
An unexpected error occurred:
Error: about:blank
Please see the logfiles in /var/log/letsencrypt for more details.
{"cmd": "report", "messages": []}

=============================================

in the  letsencrypt.log as below

=============================================

2018-11-25 02:35:05,679:DEBUG:urllib3.connectionpool:https://api.buypass.com:443 "POST /acme/authz/faQ1McIcTkT42kS8OY-VxY2wG2YGFhw2ybhlhecWmrA/2 HTTP/1.1" 50
0 89
2018-11-25 02:35:05,679:DEBUG:acme.client:Received response:
HTTP 500
Date: Sun, 25 Nov 2018 02:35:05 GMT
X-Buypass-Internal-Error-Detail-Code: INTERNAL_SERVER_ERROR
Content-Type: application/json
Access-Control-Allow-Origin: https://www.buypass.no
Access-Control-Allow-Methods: GET,HEAD,POST
Access-Control-Allow-Credentials: false
MDC-correlationId: f64db836-74d5-48bb-9ab1-fbc430a13104
Access-Control-Allow-Headers: Content-Type,Authorization,X-Requested-With,Content-Length,Accept,Origin,X-Buypass-Session-Id,X-Buypass-Locale
Cache-Control: no-store
Content-Language: en
Access-Control-Expose-Headers: Replay-Nonce, Location, Link, Content-Location
Content-Length: 89

{"code":500,"message":"INTERNAL_SERVER_ERROR","details":"HTTP 500 Internal Server Error"}
2018-11-25 02:35:05,680:DEBUG:acme.client:Ignoring wrong Content-Type ('application/json') for JSON Error
2018-11-25 02:35:05,680:DEBUG:certbot.error_handler:Encountered exception:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/certbot/auth_handler.py", line 82, in handle_authorizations
    self._respond(aauthzrs, resp, best_effort)
  File "/usr/local/lib/python2.7/dist-packages/certbot/auth_handler.py", line 158, in _respond
    self._send_responses(aauthzrs, resp, chall_update)
  File "/usr/local/lib/python2.7/dist-packages/certbot/auth_handler.py", line 191, in _send_responses
    self.acme.answer_challenge(achall.challb, resp)
  File "/usr/local/lib/python2.7/dist-packages/acme/client.py", line 157, in answer_challenge
    response = self._post(challb.uri, response)
  File "/usr/local/lib/python2.7/dist-packages/acme/client.py", line 94, in _post
    return self.net.post(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/acme/client.py", line 1130, in post
    return self._post_once(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/acme/client.py", line 1147, in _post_once
    response = self._check_response(response, content_type=content_type)
  File "/usr/local/lib/python2.7/dist-packages/acme/client.py", line 999, in _check_response
    raise messages.Error.from_json(jobj)
Error: about:blank