Renew problem - renew seem to ignore the `standalone supported challenges` option


I obtained the certificate using sudo letsencrypt certonly --standalone --standalone-supported-challenges http-01 -d -d, and verified that standalone_supported_challenges = http-01 is present in /etc/letsencrypt/renewal/ However, letsencrypt renew still tried to authenticate with tls-sni-01.

P.S I am using Cloudflare so tls-sni-01 challenge won’t work. I do not run apache-like web server, so webroot won’t work either.

My domain is:

I ran this command: sudo letsencrypt renew --dry-run -v

It produced this output:

Processing /etc/letsencrypt/renewal/
2017-02-11 11:33:03,827:INFO:letsencrypt.cli:Cert not due for renewal, but simulating renewal for dry run
2017-02-11 11:33:04,497:INFO:requests.packages.urllib3.connectionpool:Starting new HTTPS connection (1):
2017-02-11 11:33:05,569:INFO:letsencrypt.crypto_util:Generating key (2048 bits): /etc/letsencrypt/keys/0010_key-letsencrypt.pem
2017-02-11 11:33:05,580:INFO:letsencrypt.crypto_util:Creating CSR: /etc/letsencrypt/csr/0010_csr-letsencrypt.pem
2017-02-11 11:33:05,583:INFO:requests.packages.urllib3.connectionpool:Starting new HTTPS connection (1):
2017-02-11 11:33:05,705:INFO:requests.packages.urllib3.connectionpool:Starting new HTTPS connection (1):
2017-02-11 11:33:05,840:INFO:requests.packages.urllib3.connectionpool:Starting new HTTPS connection (1):
2017-02-11 11:33:05,976:INFO:letsencrypt.auth_handler:Performing the following challenges:
2017-02-11 11:33:05,977:INFO:letsencrypt.auth_handler:tls-sni-01 challenge for
2017-02-11 11:33:05,977:INFO:letsencrypt.auth_handler:tls-sni-01 challenge for

The program *** (process ID 21102) is already listening on TCP port 443.
This will prevent us from binding to that port. Please stop the *** program
temporarily and then try again. For automated renewal, you may want to use a
script that stops and starts your webserver. You can find an example at
Alternatively you can use the webroot plugin to renew without needing to stop
and start your webserver.

My operating system is (include version): Ubuntu 16.04 LTS

My web server is (include version): None

My hosting provider, if applicable, is: None

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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