I’m sorry , i was not able to copy/paste the script I really ran, but it was “standalone” of course.
Port 443 seems to be reachable.
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2016-02-04 08:14:18,688:DEBUG:root:Received <Response [200]>. Headers: {'Content-Length': '1110', 'Expires': 'Thu, 04 Feb 2016 08:14:18 GMT', 'Strict-Transport-Security': 'max-age=604800', 'Server': 'nginx', 'Connection': 'keep-alive', 'Link': '<https://acme-v01.api.letsencrypt.org/acme/new-cert>;rel="next"', 'Pragma': 'no-cache', 'Cache-Control': 'max-age=0, no-cache, no-store', 'Date': 'Thu, 04 Feb 2016 08:14:18 GMT', 'X-Frame-Options': 'DENY', 'Content-Type': 'application/json', 'Replay-Nonce': 'olfh1y2Wvqp8EVdcfM8_sVKKs9r5pwdQsedUS2mykyI'}. Content: '{"identifier":{"type":"dns","value":"www.sauvtag.com"},"status":"invalid","expires":"2016-02-11T08:14:07Z","challenges":[{"type":"http-01","status":"pending","uri":"https://acme-v01.api.letsencrypt.org/acme/challenge/rGxKUFoDK7f5c4uztXc-PEKFOMdvN9GBDW9IjUo-lvQ/13926112","token":"mKrAWt0Hmm8n9XvBUZZHo2Ae513aGpDmzeat-hwfg1M"},{"type":"dns-01","status":"pending","uri":"https://acme-v01.api.letsencrypt.org/acme/challenge/rGxKUFoDK7f5c4uztXc-PEKFOMdvN9GBDW9IjUo-lvQ/13926113","token":"wqZF4ZhzhHqETptQq-JzKsXvwPcGAVUsSAfoaMKHUzs"},{"type":"tls-sni-01","status":"invalid","error":{"type":"urn:acme:error:connection","detail":"Failed to connect to host for DVSNI challenge"},"uri":"https://acme-v01.api.letsencrypt.org/acme/challenge/rGxKUFoDK7f5c4uztXc-PEKFOMdvN9GBDW9IjUo-lvQ/13926114","token":"R9XYSRv8pZq8hZfrWR08uB48GnkZZzPyzWF_i-W7B0c","keyAuthorization":"R9XYSRv8pZq8hZfrWR08uB48GnkZZzPyzWF_i-W7B0c.INpa_xtdrWy3QzjsWTyU_4wMF2LdDXe8QENslWnA7C8","validationRecord":[{"hostname":"www.sauvtag.com","port":"443","addressesResolved":["88.179.78.63"],"addressUsed":"88.179.78.63"}]}],"combinations":[[0],[2],[1]]}'
2016-02-04 08:14:18,699:DEBUG:acme.client:Received response <Response [200]> (headers: {'Content-Length': '1110', 'Expires': 'Thu, 04 Feb 2016 08:14:18 GMT', 'Strict-Transport-Security': 'max-age=604800', 'Server': 'nginx', 'Connection': 'keep-alive', 'Link': '<https://acme-v01.api.letsencrypt.org/acme/new-cert>;rel="next"', 'Pragma': 'no-cache', 'Cache-Control': 'max-age=0, no-cache, no-store', 'Date': 'Thu, 04 Feb 2016 08:14:18 GMT', 'X-Frame-Options': 'DENY', 'Content-Type': 'application/json', 'Replay-Nonce': 'olfh1y2Wvqp8EVdcfM8_sVKKs9r5pwdQsedUS2mykyI'}): '{"identifier":{"type":"dns","value":"www.sauvtag.com"},"status":"invalid","expires":"2016-02-11T08:14:07Z","challenges":[{"type":"http-01","status":"pending","uri":"https://acme-v01.api.letsencrypt.org/acme/challenge/rGxKUFoDK7f5c4uztXc-PEKFOMdvN9GBDW9IjUo-lvQ/13926112","token":"mKrAWt0Hmm8n9XvBUZZHo2Ae513aGpDmzeat-hwfg1M"},{"type":"dns-01","status":"pending","uri":"https://acme-v01.api.letsencrypt.org/acme/challenge/rGxKUFoDK7f5c4uztXc-PEKFOMdvN9GBDW9IjUo-lvQ/13926113","token":"wqZF4ZhzhHqETptQq-JzKsXvwPcGAVUsSAfoaMKHUzs"},{"type":"tls-sni-01","status":"invalid","error":{"type":"urn:acme:error:connection","detail":"Failed to connect to host for DVSNI challenge"},"uri":"https://acme-v01.api.letsencrypt.org/acme/challenge/rGxKUFoDK7f5c4uztXc-PEKFOMdvN9GBDW9IjUo-lvQ/13926114","token":"R9XYSRv8pZq8hZfrWR08uB48GnkZZzPyzWF_i-W7B0c","keyAuthorization":"R9XYSRv8pZq8hZfrWR08uB48GnkZZzPyzWF_i-W7B0c.INpa_xtdrWy3QzjsWTyU_4wMF2LdDXe8QENslWnA7C8","validationRecord":[{"hostname":"www.sauvtag.com","port":"443","addressesResolved":["88.179.78.63"],"addressUsed":"88.179.78.63"}]}],"combinations":[[0],[2],[1]]}'
2016-02-04 08:14:18,710:DEBUG:acme.challenges:dns-01 was not recognized, full message: {u'status': u'pending', u'token': u'wqZF4ZhzhHqETptQq-JzKsXvwPcGAV
...