All renewal attempts failed. The following certs could not be renewed

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: https://demo.kerloresearch.com/

I ran this command: sudo certbot renew --dry-run

It produced this output:

Saving debug log to /var/log/letsencrypt/letsencrypt.log


Processing /etc/letsencrypt/renewal/demo.kerloresearch.com.conf


Cert not due for renewal, but simulating renewal for dry run
Plugins selected: Authenticator nginx, Installer nginx
Renewing an existing certificate
Attempting to renew cert (demo.kerloresearch.com) from /etc/letsencrypt/renewal/demo.kerloresearch.com.conf produced an unexpected error: urn:ietf:params:acme:error:malformed :: The request message was malformed :: Method not allowed. Skipping.
All renewal attempts failed. The following certs could not be renewed:
/etc/letsencrypt/live/demo.kerloresearch.com/fullchain.pem (failure)


** DRY RUN: simulating ‘certbot renew’ close to cert expiry
** (The test certificates below have not been saved.)

All renewal attempts failed. The following certs could not be renewed:
/etc/letsencrypt/live/demo.kerloresearch.com/fullchain.pem (failure)
** DRY RUN: simulating ‘certbot renew’ close to cert expiry
** (The test certificates above have not been saved.)


1 renew failure(s), 0 parse failure(s)

My web server is (include version): ubuntu 18.10

The operating system my web server runs on is (include version):

My hosting provider, if applicable, is: vultr.com

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

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot): certbot 0.27.0

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Hi @kerlosense

simple answer: Your Certbot is too old. There was a change, instead of GET a POST is required.

–> You have to update your Certbot. Or switch to another client.

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Thanks for your help can you please tell me how can i update my cerbot or switch to another client ?

Thanks In advance

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My cerboot version is certbot 0.27.0 I have install cerboot today

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How did you install certbot? You need version 0.29 as the POST-as-GET feature was introduced in 0.29.

Strange, if you go to https://packages.ubuntu.com/cosmic/allpackages (HUGE list…), it says:

certbot (0.27.0-1) [ universe ]
automatically configure HTTPS using Let’s Encrypt

However, that link there is broken…

In any case, I guess you installed it from the official Ubuntu repository. As far as I know, the certbot PPA doesn’t have packages for Ubuntu 18.10.

However, Ubuntu 18.10 is almost already a year End of Life! You should upgrade your Ubuntu, even regardless of your certbot issues!

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